◎ 题干
Newton was playing under an apple tree              an apple fell onto his head.

[     ]

A. when
B. while
C. after
D. before
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Newton was playing under an apple treean apple fell onto his head. [ ]A. when B. while C. after D. before …”主要考查了你对  【从属连词】【状语从句】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。