he___ his homework when i left my house .A.is doing B.was doing C_英语解答

he___ his homework when i left my house .A.is doing B.was doing C.did D.does

人气：291 ℃　时间：2020-03-28 08:43:28

解答

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.