单项选择题

A．when
B．what
C．where
D．why
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单项选择题
A．good-for-nothingB．hard-to-getC．not-for-profitD．one-at-a-time
A．good-for-nothing
B．hard-to-get
C．not-for-profit
D．one-at-a-time
单项选择题
A．turn upB．turn outC．turn toD．turn on
A．turn up
B．turn out
C．turn to
D．turn on
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