______for your help, we’ d never have been able to get over the difficulties.

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问题 ______for your help, we’ d never have been able to get over the difficulties.

选项 A、Had it not
B、If it were not
C、Had it not been
D、If we had not been

答案C

解析 根据句子结构,我们可以看出逗号后面是使用了虚拟语气的主句,因此,须填入表示与过去情况相反的虚拟条件句,“if it were not for...”这一结构表示同现在事实相反的假设,意为“如果不是……”。因此,B.if it were not错误。“if it had not been for...”的倒装形式为“had it not been for...”,表示与过去事实相反的假设,意为“如果当时没有……”,主句谓语形式是“would+ have done”。因此,C  Had it not been
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