__________your valuable help, we couldn\'

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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 forB．Had it not been forC．Were it not forD．If it has not been for

答案B

解析考查虚拟语气。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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__________yourvaluablehelp,wecouldn\'