问题

It was never clear _____ the man hadn’t reported the accident sooner. [ ]
A: that
B: how
C: when
D: why
B: how
C: when
D: why
正确答案是:
同类题型
____ the flight to Beijing will be delayedis ____ I’m especially worried about
Look! there _____!— Oh, yes, there _____! [ ]
Sue’s ___________ in the examination made her parents very angry..
He did not regret saying what he did but felt that he ________ it differently.
Do you often make plans your friends—Yes. I do. time with friends is so much fun, I think.