几个英语题,帮忙回答下,详细些

题目

几个英语题,帮忙回答下,详细些
1.-Are you going o Guilin by plane?
-It's fast but expensive, so I'm not sure.I 什么 take a train.
A.should B.may C.must D.will
这个我看哪个都可以啊
2.Joe has been studying Chinese for three months,but he can 什么 understand people when they speak Chinese.
A.nearly B.certainly C.usually D.hardly
这题凭什么就选D呢?
3.-Do you mind if I sit here?
-什么.It's for Miss Wood.
A.Not at all B.Never mind
C.You'd better not D.Of course not
为什么不选D
4.The book 什么 from the library must be returned this afternoon.
A.which you borrowed it
B.why you borrowed
C.you borrowed
D.what you borrowed
为什么不选A

答案

B 因为前面说 I'm not sure,所以应该是可能
D 因为是转折关系,他学了3个月的中文却还不理解人们讲中文
C 因为后面讲说这个位子是 Miss Wood的,所以应该回答最好不要
C 如果要选A的话it 应该不要的,which已经只要指代了 book,这里which是作主语,所以可有可无