Question

7. We   for the spring outing last week had it not been for the heavy fog.

A. would go         B. could go

C. could have gone    D.  must have gone

Answer 1

7.    C考査虛擬語氣。句意：要不是由于大霧，上周我們本來可以出去春游的。if引導(dǎo)的非真實(shí)條件句表示對(duì)過去的虛擬時(shí)用had done，主句用would/could/should/might have done;可以把if省略，將had提到從句句首構(gòu)成倒裝。而must have done表示"過去一定做了某事"，是對(duì)過去的肯定推測。因此選C