题目内容
【题目】—Were you at home at 7:00 last night? —Yes,I______at that time.
A. do my homework
B. did my homework
C. was doing my homework
D. am doing my homework
【答案】C
【解析】根据at that time以及at 7:00 last night,可知应该是“正在做……”,据此判断是过去进行时。
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