What did Lucy do yesterday afternoon?- She her parents do the housework.A. helpB.

问题补充：

--- What did Lucy do yesterday afternoon?

--- She her parents do the housework.

A. help

B. helped

C. will help

D. is helping

答案：

A. help

(答案→)B. helped

C. will help

D. is helping

解析：答语时态一般要与问句时态保持一致，问句为过去时态，所以选B.