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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 【查看更多】

     

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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

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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

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     Newton was playing under an apple tree____ an apple fell onto his head.

          A. while                            B. when                            C. before

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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

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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

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