单项选择题


A.inventing
B.improving
C.finding
D.discovering
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单项选择题
A.rarely worthlessB.nearly uselessC.almost of no useD.rarely invaluable
A.rarely worthless
B.nearly useless
C.almost of no use
D.rarely invaluable
单项选择题
A.bothB.neverC.eitherD.neither
A.both
B.never
C.either
D.neither
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