if后加过去完成时,主句怎么变if there had not been a hard layer of rock be
if后加过去完成时,主句怎么变
if there had not been a hard layer of rock beneath the soil,they (complete)the job in a few hours
if there had not been a hard layer of rock beneath the soil,they (complete)the job in a few hours
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你能帮帮他们吗