______your help, they’d never have been able to overcome the difficulties.

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问题 ______your help, they’d never have been able to overcome the difficulties.

选项 A、Were it not
B、If it was not
C、Had it not been for
D、Had it not for

答案C

解析若虚拟条件句中含有were，had或should等时，连词if可以省略，并使用倒装语序。were it not若不是…的话，若非。had it not been for如果不是因…。

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