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We are now in the age of great changes. Everything sometimes ________ before it is felt.

A.change B.had changed C.has changed D.changed 

C

解析试题分析:整个句子用的都是现在时,所以排除BD选项。主语是“everything”故排除A选项。用现在完成时强调结果。句意:我们现在处在伟大的变革时代。常常是等到一切变化了我们才感觉到。
考点:动词的时态

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