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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