Newton was playing under an apple tree an apple fell onto his head．
A．when B．while C．after D．before
科目：初中英語 來源： 題型：
Newton was playing under an apple tree an apple fell onto his head．
A．when B．while C．after D．before
科目：初中英語 來源：2008年山東省東營市初中畢業(yè)升學統(tǒng)一考試、英語試卷 題型：016
Newton was playing under an apple tree ________ an apple fell onto his head．
A．when
B．while
C．after
D．before
科目：初中英語 來源： 題型：
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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