题目内容
Newton was playing under an apple tree _____an apple fell onto his head.
A．when B．while C．after D．before
试题答案
1、A
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Newton was playing under an apple tree _____an apple fell onto his head.
A．when B．while C．after D．before
查看习题详情和答案>>题目内容
Newton was playing under an apple tree _____an apple fell onto his head.
A．when B．while C．after D．before
试题答案
1、A
Newton was playing under an apple tree _____an apple fell onto his head.
A．when B．while C．after D．before
查看习题详情和答案>>