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单选题
______ your help, they’d never have been able to overcome the difficulties.
A
Were it not
B
If it was not
C
Had it not been for
D
Had it not for
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参考解析
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…。
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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