单项选择题


A．check-in
B．check-out
C．check-up
D．double-check
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单项选择题
A．gratificationB．gratitudeC．appreciativeD．regret
A．gratification
B．gratitude
C．appreciative
D．regret
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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