◎ 题干
He asked who was the man ____ on.

[     ]

A. to be operating
B. operating
C. to operate
D. being operated
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“He asked who was the man ____ on. [ ]A. to be operating B. operating C. to operate D. being operated …”主要考查了你对  【现在分词的被动式】  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。