单项选择题
A.defined
B.spread
C.taught
D.discussed
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单项选择题
A.inventingB.inventedC.to inventD.being invented
A.inventing
B.invented
C.to invent
D.being invented
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单项选择题
A.withB.inC.onD.for
A.with
B.in
C.on
D.for
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