She was moving out of her old apartmentshe suddenly realized that the key to the new apart

发布时间：2020-08-16 19:29:10

She was moving out of her old apartment    she suddenly realized that the key to the new apartment wasn’t on her.
A. until
B. once
C. when
D. before

网友回答

A. until
B. once
(答案→)C. when
D. before
解析：句型be doing sth when “刚要做某事这时…”
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