搜搜做题作业网By the time she left school ,she ___ that course for ten yea
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By the time she left school ,she ___ that course for ten years.A.taught B.has taught C.had taught D.will have taught 为什么不是用将来完成时?
正解是C .
题目暗示点 是 By the time she left school
she left school 的动作发生在过去,by 在这里是 在某个时间以前.在她离开学校以前,那么teach 的动作发生在离开学校以前,表示过去的过去,用过去完成时had taught .
再问： 如果把left改成leave 呢
再答： 要是改为 leaves , 那就用将来完成时或现在完成时，取决于具体内容。
题目暗示点 是 By the time she left school
she left school 的动作发生在过去,by 在这里是 在某个时间以前.在她离开学校以前,那么teach 的动作发生在离开学校以前,表示过去的过去,用过去完成时had taught .
再问： 如果把left改成leave 呢
再答： 要是改为 leaves , 那就用将来完成时或现在完成时，取决于具体内容。
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