◎ 题干
He must have gone out. I heard the noise of the door _____ when I was still in bed.
[     ]
A. being locked
B. to lock
C. locking
D. having locked
◎ 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 must have gone out. I heard the noise of the door _____ when I was still in bed.[ ]A. being lockedB. to lock C. locking D. having locked …”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。