【题目】What ____ he_____ when his mother opened the door?
A. did, do B. had, done C. will, do D. was, doing
【答案】A
【解析】略
【题目】What ____ he_____ when his mother opened the door?
A. did, do B. had, done C. will, do D. was, doing
【答案】A
【解析】略
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