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【题目】Newton was playing under an apple tree _______ an apple fell on his head.

A. until B. while C. when D. after

【答案】C

【解析】句意:当牛顿在树底下玩得时候,这时一个苹果落到了他的头上。这里是when引导的时间状语从句,这时的意思;A. until直到;B. while当……的时候;C. when当……的时候;D. after在……之后。根据题意,故选C。

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