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问题: N2 88

They would have completed the job in a few hours _____ the hard layer of rock .

A except B but for C if not D unless

先不公布答案,请问选哪个,原因呢?我怎么觉得C也可以,为什么不选C呢?

解答:

选B.项,C.项不完整,即使是if not for,也没有B.项有强调力度。