The first thing____my brother is going to do this afternoon is to write a letter.C.why D.who答案为什么是B.而不能选A

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Thefirstthing____mybrotherisgoingtodothisafternoonistowritealetter.C.whyD.who答案为什么是B.而不能选AThefirstth

The first thing____my brother is going to do this afternoon is to write a letter.C.why D.who答案为什么是B.而不能选A
The first thing____my brother is going to do this afternoon is to write a letter.
C.why D.who
答案为什么是B.而不能选A

The first thing____my brother is going to do this afternoon is to write a letter.C.why D.who答案为什么是B.而不能选A
that
先行词有序数词修饰时用that

应该用that引导这个定语从句，因为出现first时不能用which，只能用that。

应该填that引导定语从句，因为thing前面有first修饰。

同意楼上用that

my brother is going to do this afternoon是first thing的定语，可以跳过不看
is to write a letter to who，这里就少了给谁写信了
里面没有问原因的意思，只能选择who.

that,先行词前有序数词，关系代词选择that ，而不用which。

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分析句子成分有助于理
【The first thing主语，先行词】【（that）my brother is going to do this afternoon定语从句】【 is谓语】【to write a letter.表语】
此句定语从句，要用关系代词时，必须用that，原因是：先行词是thing，受the first 修饰，指物时关系代词只能用that，不用which。这里，关系代词做从句中的宾语，也可以省略不填。
你也可以参考这个链接
http://zhidao.baidu.com/question/275501236.html?an=0&si=1
祝你开心如意！O(∩_∩)O~~

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the first The first first of all first the first at first的区别 the first of the first of all,first,at first,for the first time,the first time有什么区别英语翻译 in the first. win the first for the very first in the first place the first time 造句 at the first crossing 例如The first four take the first for the first time. the first three the first thing April the first翻译 in the first half