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I _____ his telephone number. Had I known it, I would have rung him up.
A.don’t knownB.didn’t know
C.hadn’t knownD.haven’t known
B
    
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。
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