问题补充:
Can you tell me what you when the teacher came into the classroom?
A. did
B. do
C. are doing
D. were doing
答案:
A. did
B. do
C. are doing
(答案→)D. were doing
解析:句意;你能告诉我当老师进入教室时,你正在做什么吗?结合语境可知宾语从句中描述的是过去某时正在进行的动作,故用过去进行时态。选D。
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