Question

—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

B

过去进行时的用法。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。