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

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

【答案】D

【解析】

句意:他夜以繼日地在實(shí)驗(yàn)室里工作。考查動(dòng)詞形式辨析題。keep doing something不斷地/繼續(xù)做某事,固定短語(yǔ);根據(jù)句意語(yǔ)境,可知選D。

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