_______ your valuable help, we couldn't have finished the experiment ahead o...

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

选项 A．If it were not for
B．Had it not been for
C．Were it not for
D．If it has not been for

答案B

解析考查虚拟语气。根据语境可知是与过去事实相反，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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