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he lost one of the books which borrowed from A were B was C

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he lost one of the books which borrowed from A were B was C had D have 为什么不能选A?
he lost one of the books which borrowed from A were B was C
C是错误的.应该是had been.
He lost one of the books which had been borrowed from thelibrary.
再问: 那用were不行吗?
再答: 用were这里有点不妥,因为被借动作发生在丢失之前。所以要用had been。 补充一点,假如有特定的时间状语如last year,yesterday等,可以用were。 希望对你有所帮助。