if there had not been a hard layer of rock beneath the soil,they would have completed the job in a few hours.這句話為什么要用過去完成時呢?為什么不用一般過去式呢?改成這樣 if there were not a hard layer of rock beneath the soil,they would have completed the job in a few hours這樣不是更好嗎?為什么呢?
用過去完成時他語境更加強調(diào)了什么呢？