题目内容
As we all know, great changes _______ in China in the past thirty years.
| A．took place | B．have taken place |
| C．happened | D．have happened |
B
解析试题分析： take place 表示有计划，有安排的发生，happen是偶然的发生；家乡发生了变化是在计划之中的。根据句意; 中所周知，过去的30年中中国发生了伟大的变化在。根据语境可知用现在完成时；根据句意故选B
考点：考查动词的时态。
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