—Did you watch the film Frozen on the Internet yesterday? — No I my mother do housework a

问题补充：

—Did you watch the film Frozen on the Internet yesterday?

— No, I my mother do housework all day.

A. was helping

B. would help

C. had helped

D. help

答案：

(答案→)A. was helping

B. would help

C. had helped

D. help

解析：句意：你昨天在网上看了 Frozen这个电影吗？--没有，我整天都在帮助妈妈做家务。这里的all day是指昨天一整天，所以help这个动作是过去的一段时间正在做…，用过去进行时，所以选A。