单选题

_______ your valuable help, we couldn’t have finished the experiment ahead of time.

AIf it were not for

BHad it not been for

CWere it not for

DIf it has not been for

正确答案

答案解析

本题考查虚拟语气和倒装

B选项，由主句谓语可知本题是与过去事实相反的虚拟条件句，条件从句谓语用“had+过去分词”，如果省略if，从句要用倒装语序，即把had移到主语前面。综上，B选项正确。

A选项，与题意不符，故排除。

C选项，与题意不符，故排除。

D选项，与题意不符，故排除。

故正确答案为B 项。

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