问题
选择题
The discussion _______ alive when an interesting topic was brought in.
A．was coming
B．had come
C．has come
D．came
答案
D
讨论变得有趣是在有了好话题之后，所以B项错；come alive是瞬间性的，所以A项错；如选C项，when应改为since。
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