題目列表(包括答案和解析)
Newton was playing under an apple tree an apple fell onto his head．
A．when B．while C．after D．before
Newton was playing under an apple tree ________ an apple fell onto his head．
A．when
B．while
C．after
D．before
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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