The family has been in American_.a.for a last year b.since last year为何选 aI _ for mushrooms but I haven't found any.a.have been looking b.have looked为何选 a,b 错在哪It was so dark outside that he_.a.didn't dare to go out to fetch waterb.d

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ThefamilyhasbeeninAmerican_.a.foralastyearb.sincelastyear为何选aI_formushroomsbutIhaven''tfoundany.a.hav

The family has been in American_.a.for a last year b.since last year为何选 aI _ for mushrooms but I haven't found any.a.have been looking b.have looked为何选 a,b 错在哪It was so dark outside that he_.a.didn't dare to go out to fetch waterb.d
The family has been in American_.
a.for a last year b.since last year
为何选 a
I _ for mushrooms but I haven't found any.
a.have been looking b.have looked
为何选 a,b 错在哪
It was so dark outside that he_.
a.didn't dare to go out to fetch water
b.dare not to fetch water
为何选 a

The family has been in American_.a.for a last year b.since last year为何选 aI _ for mushrooms but I haven't found any.a.have been looking b.have looked为何选 a,b 错在哪It was so dark outside that he_.a.didn't dare to go out to fetch waterb.d
从语法角度来讲这几个选项都没有错,只是语义不同,要根据上下文意思来理解.
1.for a last year 意思是已经在美国一整年了,强调这一整年都在,last 表示一个持续的概念.since last year 意思是自从去年就在美国了,强调从去年开始的,last 表示过去的概念.
2.have been looking 意思是从过去到现在一直在找,动作没有停止过.have looked 意思是过去找过,但后来停止了,没有再找了.
3.didn't dare to go out to fetch water 这里的dare是用做实意动词,强调敢不敢.dare not to fetch water 这里的dare是用做助动词,没有突出dare的意味.

晕...
原则就是哪个长选哪个....哈哈,下面的只是个人的理解
第二个的look for 是个和go 一样的不可以直接用于完成时的动词,所以a
第三个的dare是vi.动词,否定就是靠didn't

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The family has been in America_.
a.for a last year b.since last year
为何选 a
==>绝对应该选b, 没有a这种说法。since在这里是介词，谓语用现在完成时没错,表示从去年起到现在还住在美国，这个句子是现在完成时的典范，我楼上的人竟然还可以编出一番歪理? 不知道谁告诉你选a的。
顺便说一下，American应该是America.
I _ for mushrooms but I haven't found any.
a.have been looking b.have looked
为何选 a,b 错在哪
==>选b的话从句的时态不对，应该用过去式。而A是现在完成进行时，表示过去在找，现在还在找。
这样说也是对的：I have looked for mushrooms but I didn't find any.但是意思就有变化了－－－现在已经没在找蘑菇了。
It was so dark outside that he_.
a.didn't dare to go out to fetch water
b.dare not to fetch water
为何选 a
==>dare后面有to的时候，显然dare不是情态动词而是实义动词，既然它不是实义动词就应该有时态的变化，而且实义动词也不能直接在后面加not表示否定:一定要借助助动词来否定，b去掉to就对了。

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