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

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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，如果省略if，句子要倒装，倒装时要将助动词提前，故选B。

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