Question

【题目】—Why didn't you go to play football with us yesterday afternoon?
—I my mother with the housework then.
A.helped
B.was helping
C.had helped
D.have been helping

Answer 1

【答案】B
【解析】句意：－昨天下午你为什么不和我们去踢足球呢？－那时我正帮我母亲做家务。表示过去的时间正在做某事，用过去进行时。故选B。