英语选择并说明理由1/ He must be from Africa,_________ can be seen from his skin.A.that B.as C.who D.what2/ I was about to go shopping _________ it began to rain.A.while B.as C.when D.though

英语选择并说明理由1/ He must be from Africa,_________ can be seen from his skin.A.that B.as C.who D.what2/ I was about to go shopping _________ it began to rain.A.while B.as C.when D.though
英语选择并说明理由
1/ He must be from Africa,_________ can be seen from his skin.
A.that B.as C.who D.what
2/ I was about to go shopping _________ it began to rain.
A.while B.as C.when D.though

英语选择并说明理由1/ He must be from Africa,_________ can be seen from his skin.A.that B.as C.who D.what2/ I was about to go shopping _________ it began to rain.A.while B.as C.when D.though
第一题选 B
这道题 考察的是 非限制性定语从句.
非限制性定语从句可以由as 和 which 引导,
which 只能放在句中,（就事论事,可以指代前面的先行词,也可以指代前面整个一句话）
as 可以句首（往往是大家都知道的事情）
放在句中可以=which就事论事,也可以是 大家都知道的事情.
这道题填 which 和 as 都对,都是 指代 前面 整句话的内容.
Athat 不能出现在非限制定语从句中.
C指代的是 人,这句话 明显是指代前面的全部内容.
D不是定语从句的关系词.故错.
第二题：选C
记住句型即可：
be about to do sth when············刚好要做········突然···············

对语法真的忘得差不多了~

1、B首先看整个句子，可以确定这是一个非限定性定语从句，排出A；然后根据句意可以推测说是“根据他的皮肤就可以看出来”，所以选B
2、C似乎有一个短语“be about to do ...when”,所以选C

1. He must be from Africa, _________ can be seen from his skin.
答案：B. as
解释：
as确实可以引导方式状语，比如I did the work as my father taught me.
但是，这里是定语从句，只不过先行词不是一个名词或者代词，而是整个句子。
在非限制性定...

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1. He must be from Africa, _________ can be seen from his skin.
答案：B. as
解释：
as确实可以引导方式状语，比如I did the work as my father taught me.
但是，这里是定语从句，只不过先行词不是一个名词或者代词，而是整个句子。
在非限制性定语从句中，which和as可以引导定语从句修饰整个句子，注意that、where、when、why等都不行。
举列子：They did rather badly in the maths exam,which was not what I had expected.
句子中，“They did rather badly in the maths exam” 是我所没意料到的。
还有就是 as we all know 结构：
As we all know, china is a developping country.
这里we all know 的内容就是“china is a developping country”这整一句话。
补充一下，as引导方式状语时，从句式完整的句子，而引导定语从句时，则从句缺少成分，比如As we all know，缺少的就是know 的宾语，而宾语其实就是主句“china is a developping country”


2. I was about to go shopping _________ it began to rain.
答案：C. when

解释：
固定句型be about to do ……when……表示正要做某事时，突然另一件发生，这题的意思就是：当我正要去购物的时候突然下雨了。

when在此句做并列连词，类似于and then“就在这时”，引导的是并列句。它并不是从属连词以引导时间状语从句。
when此种用法如果用在过去时的并列句中时，前句有三个特点，即：可能使用过去进行时，或过去完成时，或was about to do sth结构，而后句则使用一般过去时。
而as是没有这种用法的（as做从属连词引导时间状语从句时，更多强调主从句动作同时进行）。
如：I was sleeping when the telephone rang. 我正在睡觉，就在这时电话响了。
I had waited for 3 hours when he came at last. 我已经等了3个小时了，就在这时他终于来了。
I was about to leave when the door opened. 我正要离开，就在这时门开了。

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第一条选B, who 是指他；可以从他的肤色看出他是从非洲来的
第二条选C，when是指时态；当开始下雨时，我正好要去逛街

1/ He must be from Africa, _________ can be seen from his skin.
A. that B. as C. who D. what

以上考察AS 引导非限制性定语从句，代替前面整句话的内容，所以答案为B 答案
句子意思：他一定是来自非洲，这一点，可以从他的皮肤可以看出来
...

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1/ He must be from Africa, _________ can be seen from his skin.
A. that B. as C. who D. what

以上考察AS 引导非限制性定语从句，代替前面整句话的内容，所以答案为B 答案
句子意思：他一定是来自非洲，这一点，可以从他的皮肤可以看出来
2/ I was about to go shopping ____C_____ it began to rain.
A. while B. as C. when D. though

以上考察 Sb +is about to do sth +when 结构用法，意思，主语某人正要做某事，就在这个时候，从句动词发生了，因此答案为C答案
句子意思：我正要出去购物，这时候开始下雨了
备注：WHEN=AT THIS TIME 的用法 意思，就在这个时候，

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1.B.非限定性定语从句，as指代前面整个句子。
2.C.可以看成是固定搭配be about to do sth.when...