单项选择题
A.use
B.used
C.using
D.uses
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单项选择题
A.inventionB.discoveryC.discoveringD.inventing
A.invention
B.discovery
C.discovering
D.inventing
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单项选择题
A.afterB.untilC.thoughD.since
A.after
B.until
C.though
D.since
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