问题补充:
If he me his telephone number yesterday, I able to ring him up now.
A. told, would be
B. had told, would have been
C. had told, would be
D. told, am
答案:
A. told, would be
B. had told, would have been
(答案→)C. had told, would be
D. told, am
解析:句意,如果昨天他告诉我他的电话号码,我现在就能给他打电话了。这是一个虚拟条件句,条件从句表示的动作和主句表示的动作发生的时间不一致,所以这是一个错综时间条件句。此时主、从句动词的形式应根据各自所表示的时间进行调整,if条件句是对过去的虚拟,故用过去完成时,而主句是对现在的虚拟,故用 would do形式,故选C。