单项选择题
A.rarely worthless
B.nearly useless
C.almost of no use
D.rarely invaluable
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单项选择题
A.bothB.neverC.eitherD.neither
A.both
B.never
C.either
D.neither
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单项选择题
A.need knowB.want to learnC.need to knowD.need to study
A.need know
B.want to learn
C.need to know
D.need to study
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