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

A．when            B．while              C．after              D．before

1、A

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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．a(chǎn)fter              D．before

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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．a(chǎn)fter                             D．before

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科目：初中英語 來源：2008年山東省東營(yíng)市初中畢業(yè)升學(xué)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

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