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Newton was playing under an apple tree _____an apple fell onto his head.
A.when B.while C.a(chǎn)fter D.before
Newton was playing under an apple tree____ an apple fell onto his head.
A. while B. when C. before
Newton was playing under an apple tree an apple fell onto his head.
A.when B.while C.a(chǎn)fter D.before
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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