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Newton was playing under an apple tree___an apple fell onto

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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
请问选择哪一个,及分别说出每个为什么对与错.
Newton was playing under an apple tree___an apple fell onto
选A when在这里是这时的意思 while应用于进行时的句子 前面有was playing,所以不能选后两个.