有关虚拟语气We didn't know his telephone number,otherwise we_____h

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有关虚拟语气
We didn't know his telephone number,otherwise we_____him.
A.would telephone B.would have telephoned
C.had telephoned D.must have telephoned
请问选什么,为什么.谢谢.
对,我也选的B但是答案给的C.这个句子省略了条件句,那哪个是从句,哪个是主句,如果说还原成"if we had knewn his telephone number,we would have telephone him"...也不可能是C啊?难道直接对过去发生的进行虚拟,had telephoned?

B
因为前句是过去时态,这里应该用过去将来完成时态.
“我们不知道他的电话号码,如果知道我们早就给他打过电话了”

有关虚拟语气We didn't know his telephone number,otherwise we_____h We didn't know his telephone number, otherwise we ___ him. 1.We didn't know his telephone number,otherwise we _____ him We didn't know his telephone number,otherwise we ___ him We didn't know his telephone number, otherwise we would have 英语语法：虚拟语气I didn't know his telephone number.____ it,I ____ t 虚拟语气 i didn't know his telephone number.____ it,I ______ the I didn't know his telephone number We did not know his telephone number,otherwise we ____ him. I forgot his number,so I didn't ring him改为虚拟语气还要倒装怎么搞? I know his telephone number ____（not know）his telephone number,