--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

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--Didyoumeettheprofessorattheairport?--No,he_____bythetimeI_____there.A.hadleft;gotB.hasleft;reached

--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
--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

--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.

A by the time前用过去完成时,后用过去时

A。我到达之前教授已经走了,动作发生在我到达之前,故用过去完成时。

A.因为说的是过去的事情,因此整体上要用过去时。而离开是在我到达之前,因此用过去完成时。

A
首先C和D直接排除,这里主要考察的就是完成时态。

选A吧,首先前面是did说明这是过去式,而他离开时发生在我到那之前,所以是过去的过去。

reach是瞬时性动词,不能用过去完成时