问题

The reason for _______ he failed in theexam was that he was too careless.
A:which
B:why
C:that
D:it
B:why
C:that
D:it
正确答案是:
同类题型
What Tom did made his mother______.
So far this year we______a fallin house prices by between 5 and 10 percent.[ ]
I’d like to talk to someone who looks .
Speaking of Tom, there are several things that are not easy to ____ ,say, his dishonesty.
Only after they had discussed the matter for a few hours ______ a decision.