问题补充:
I his telephone number. Had I known it, I would have rung him up.
A. don’t known
B. didn’t know
C. hadn’t known
D. haven’t known
答案:
A. don’t known
(答案→)B. didn’t know
C. hadn’t known
D. haven’t known
解析:
试题分析:考查动词时态。后句的虚拟语气是对过去的虚拟,由此可知此处是讲述过去的事实,故用一般过去时,答案选B。句意:我不知道他的电话号码。如果我知道的话,我就会给他打电话了。