By the time I got to the bus stop, the bus         .
A、has already left             B、already left         C、had already left
C

試題分析：句意：當我到達公共汽車停車點的時候，公共汽車已經(jīng)離開了。A、has already left  已經(jīng)走了， 現(xiàn)在完成時態(tài)；  B、already left走了， 一般過去時態(tài)；C、had already left已經(jīng)走了， 過去完成時態(tài)。 by the time截止到什么時候，本句left發(fā)生在got to之前，所以要用過去完成時態(tài)，had+動詞的過去分詞，故選C.
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