The discussion alive when an interesting topic was brought in. A. was comingB. had comeC.

发布时间：2020-08-17 12:46:50

The discussion      alive when an interesting topic was brought in.
A. was ing
B. had e
C. has e
D. came

网友回答

A. was ing
B. had e
C. has e
(答案→)D. came
解析：由when…was brought in可知，e也是过去发生的事，用一般过去时。句意是：当引入一个有趣的话题时，那场讨论又变得活跃起来。
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