— Why didn’t you come to play football with us yesterday afternoon? — I my mother with t

问题补充：

— Why didn’t you come to play football with us yesterday afternoon?

— I my mother with the housework then.

A. was helping

B. helped

C. had helped

D. have been helping

答案：

(答案→)A. was helping

B. helped

C. had helped

D. have been helping

解析：句意：昨天下午你为什么不来和我们一起踢足球呢？那时我在帮我妈妈做家务。根据then及情景可知该用过去进行时，所以选A。