5.The discussion ______alive when an interesting topic was b

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5.The discussion ______alive when an interesting topic was brought in.
A.was coming B.had come C.has come D.came

ABCD都可以用,只不过A不怎么合适,因为有趣的话题入题才使讨论活跃起来,而不是讨论已经活跃才入来.
答案应该是B或D...C之所以不太合适是因为后面用了when,暗示过去时,而C是现在时.
B.had come,好像后面也需要有个had,比如when an interesting topic had been brought in.
所以,答案应该是D,came alive.

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