Question

【题目】Alice is very helpful. I saw her ________ the old clean their houses when I passed by the other day.

help B. helps C. helped D. helping

Answer 1

【答案】D

【解析】句意：Alice是非常乐于助人的。有一天当我经过的时候，我看见她正在帮助老人打扫他们的房间。See sb doing sth看见某人正在做某事。故选D。