自考《英语（二）》真题练习：虚拟语气

单选题

[2007.04]If the operation ________ carefully prepared，it would not have been successful.

A.was not

B.has not been

C.had not been

D.were not

正确答案：C

答案解析：本题考查虚拟语气。主句是对过去的虚拟，所以根据句意，条件状语从句也应该是对过去的虚拟，所以用had done的形式。句意：如果手术没有经过认真仔细的准备，它就不会成功。