In the past twenty years great changes _______in China.
A．were taken placeB．have been taken place
C．have taken placeD．were happened
C
考查固定短語的用法。句意“在過去的二十年里，中國發(fā)生了巨大的變化。”take place“發(fā)生”，不用于被動語態(tài)，排除A、B；happen“（偶然）發(fā)生”，不用于被動語態(tài)。in+一段時間與現(xiàn)在完成時連用。故選C。
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