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问题: 寻求英语选择题答案及原因

1._______has been said before,it is not easy to
learn a foreign language.
A.As B.It C.What D.As it
选A还是选D,请说出原因?
2.After ______seemed half an hour the teacher
gave us the correct answer.
A.that B.what C.which D.it
为什么不选A? 为什么不选D? 最终选择B.
3.It is a____difficult question ,so it is _____
impossible for me to answer it.
A.rather;quite B.too;quite C.so;fairly
D.very;rather
请解释A.B.C.D.的区别并选出最终答案.
4.Who was the first man on the moon?
I have no idea who______.
A.the first man on the moon was
B.was the first man on the moon
C.if the first man on the moon was
D.whether thefirst man on the moon was
请说出A.B.区别并选出答案.

解答:

.____As___has been said before,it is not easy to
learn a foreign language.
as引导的非限定性定语从句,相当于从句中作主语,如果用as it的话主就重复了

After ___what___seemed half an hour the teacher
gave us the correct answer.
从句中that不能放在介词后面,it不引导从句

It is a____difficult question ,so it is _____
impossible for me to answer it.
首先确定这几个词的用法
a/an+rather+形容词+名词. rather+a/an+形容词+名词. 都可以
too/so+形容词+ a/an +名词
quite + a/an+形容词+名词. quite + 形容词
总觉得AD都可以,可能从意思上排除吧,我不懂了

Who was the first man on the moon?
I have no idea who___was the first man on the moon ___.
who是对主语的提问,充当主语,the first man是表语,不要以为是主语
从句中用正常语序,不倒装