people were watching the sky, the alien got out of the UFO.A. IfB. WhenC. BecauseD. While

发布时间：2020-08-22 02:11:20

     people were watching the sky, the alien got out of the UFO.
A. If
B. When
C. Because
D. While

网友回答

A. If
B. When
C. Because
(答案→)D. While
解析：while引导的时间状语从句常用进行时态.
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