单项选择题
A.invention
B.discovery
C.discovering
D.inventing
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单项选择题
A.actualityB.actuallyC.actionD.actual
A.actuality
B.actually
C.action
D.actual
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单项选择题
A.forB.aboutC.withD.to
A.for
B.about
C.with
D.to
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