_______ your valuable help, we couldn’t have finished the experiment ahead of time.
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单选题
A
If it were not for
B
Had it not been for
C
Were it not for
D
If it has not been for
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答案:
解析:
本题考查虚拟语气和倒装。根据题干中的句子“_______ your valuable help, we couldn’t have finished the experiment ahead of time.”可知,这是一个与过去事实相反的虚拟条件句。虚拟条件句的条件从句谓语用“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。因此,正确答案为“Had it not been for”。选项B中的“Had it not been for”符合虚拟条件句和倒装的要求,因此是正确答案。选项A、C、D与题意不符,故排除。
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