问题
选择题
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
答案：A
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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：A