单选题
Great changes______ place since he left here.
A、
[A] have been taken
B、
[B] have taken
C、
[C] were taken
【正确答案】
B
【答案解析】
[考点] 时态和固定搭配 [解析] take place 为固定搭配，指“(事物)发生”，它用物作主语，只用主动语态。状语从句用since 引导，主句应用完成时。
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