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
答案：D
由when…was brought in可知，come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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