All the guests at the party were dancing and singing happily the electricity was cut off.

发布时间：2020-08-17 09:39:46

All the guests at the party were dancing and singing happily      the electricity was cut off.
A. until
B. while
C. when
D. because

网友回答

A. until
B. while
(答案→)C. when
D. because
解析：句意：当电源被切断后，聚会上的所有客人都高兴地又唱又跳。Until直到；while然而；when当……时候；because因为，选C。
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