—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
网友回答
(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。