The chairman was about to declare the conference open the lights went all out.A. asB. whi

发布时间：2020-08-16 14:09:07


The chairman was about to declare the conference open      the lights went all out.
A. as
B. while
C. then
D. when

网友回答

A. as
B. while
C. then
(答案→)D. when
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