--Did you meet the professor at the airport?--No,he _____ by

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--Did you meet the professor at the airport?--No,he _____ by the time I _____ there.
A.had left;got B.has left ;reached C.was leaving ;got D.left ;had got

A
by the time 是过去完成时的标志.
前面的动作用过去完成时,后面的动作用一般过去时.
再问： reached为什么不行，能把其他时态解释一下吗
再答： B reached 也可以，但是前一个动词用了has left ，是现在完成时。根据by the time 应该用过去完成时。

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