摘要： 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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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
查看习题详情和答案>>Newton was playing under an apple tree____ an apple fell onto his head.
A. while B. when C. before
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