__________your valuable help, we couldn't have finished the experiment ahead of time.
2023-08-04
A.If it were not for
B.Had it not been for
C.Were it not for
D.If it has not been for
参考答案:B
B.Had it not been for
C.Were it not for
D.If it has not been for
参考答案:B
考查虚拟语气。本题是与过去事实相反的虚拟语气,如果省if,句子要倒装,倒装时要将助动词提前.故选B。
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