单项选择题

() for your help, we never have been able to overcome the difficulties.

A. Had it not
B. lf it were not
C. Had it not been
D. If we had not been

<上一题目录下一题>

热门试题

填空题

the traffic, the pollution in the air and the rubbish in the streets

填空题

We propose that the problem (discuss) ______ at the next meeting