【題目】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:當牛頓在樹底下玩得時候,這時一個蘋果落到了他的頭上。這里是when引導的時間狀語從句,這時的意思;A. until直到;B. while當……的時候;C. when當……的時候;D. after在……之后。根據(jù)題意,故選C。

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