单项选择题
A.was discovered
B.was invented
C.discovered
D.invented
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单项选择题
A.onB.ontoC.intoD.in
A.on
B.onto
C.into
D.in
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单项选择题
A.intoB.forC.byD.from
A.into
B.for
C.by
D.from
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