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
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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