单项选择题

A．function
B．operation
C．commission
D．engagement
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单项选择题
A．whenB．whatC．whereD．why
A．when
B．what
C．where
D．why
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
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