请帮我填填这几道选择题,要加解析为什么选这个!

题目

请帮我填填这几道选择题,要加解析为什么选这个!
The____brothers don't look the same.But they are ___eleven.
A.twins all B.twin's,both C.twin,both D.twin all
I don't think we can finish our homework._____?
A.can we B do I C.can't we D.don't I
What ____useful book!And ____book is very interesting.
A.an a B.a a C.a the D.an the
Sometimes walking is ___than driving during the busy traffic time
A.fast B.faster C.slow

答案

C A C B
1 twin brothers固定搭配,记住即可.
2 从句中主语为we,所以人称和动词跟从句走,肯定否定看主句.（若从句主语是第一人称以外的,一切都看主句.）
3 useful 虽为元音字母开头,但并非元音音素开头,所以用a 下一空,两次重复提到同一物品用the
4 比较级 选B