问题补充:
______ for the free tickets, I would not have gone to the films so often.
A. If it is not
B. Where it not
C. Had it not been
D. If they were not
答案:
A. If it is not
B. Where it not
(答案→)C. Had it not been
D. If they were not
解析:Had it not been是if it had not been的倒装形式,意思是“要不是……”。