When the students came into the room,the teacher__on the blackboard.应该填什么时态
When the students came into the room,the teacher__on the blackboard.应该填什么时态
A,is writing B,was writing C,wrote应该选哪个,为什么
A,is writing B,was writing C,wrote应该选哪个,为什么
英语人气：359 ℃时间：2019-10-18 08:45:19
优质解答
B,前面When引导的从句是过去式
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