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【题目】Scientists have come up with a theory for why time flies when you are having fun and when you are bored.

A. stops B. falls

C. fades D. drags

【答案】D

【解析】考查动词。A. stops 停止; B. falls下降; C. fades 腿色; D. drags拖,拉。科学家们已经提出了一个理论,为什么当你快乐的时候光阴似箭当你感到厌烦的时候时间拖拉。根据句意可知选D。

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