Smoking is not allowed in the workplace because the air must be ____________.[ ]A. keep clean B. kept cleaningC. kept clean D. kept to clean-初中英语-n多题

◎ 题干

Smoking is not allowed in the workplace because the air must be ____________.

[ ]

A. keep clean
B. kept cleaning
C. kept clean
D. kept to clean

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◎ 解析

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◎ 知识点

根据n多题专家分析，试题“Smoking is not allowed in the workplace because the air must be ____________.[ ]A. keep clean B. kept cleaningC. kept clean D. kept to clean…”主要考查了你对【实义动词的过去分词】等知识点的理解和应用能力。关于这些知识点的“档案”，你可以点击相应的链接进行查看和学习。

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