Question

【题目】He keeps ________ in the lab day and night.

A. work B. works C. to work D. working

Answer 1

【答案】D

【解析】

句意：他夜以继日地在实验室里工作。考查动词形式辨析题。keep doing something不断地/继续做某事，固定短语；根据句意语境，可知选D。