B
when 引导的状语从句,当一个动作发生时,另一个动作正在进行,根据LEFT 可知主句用过去进行时.
he___ his homework when i left my house .A.is doing B.was doing C.did D.does
he___ his homework when i left my house .A.is doing B.was doing C.did D.does
英语人气：792 ℃时间：2020-03-28 08:43:28
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