单项选择题
A.was used
B.used
C.is used
D.are used
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单项选择题
A.was discoveredB.was inventedC.discoveredD.invented
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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