He slipped into the classroom without .A. noticed B. noticingC. being noticed D. was noticed 题目和参考答案——青夏教育精英家教网—

题目内容

He slipped(溜进) into the classroom without ___________.

A. noticed B. noticing

C. being noticed D. was noticed

【解析】

试题分析：考查非谓语动词。句中的without为介词，且notice与主语he之间被被动关系。句意：他乘没人注意溜进了教室。故C正确。

考点：考查非谓语动词

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