单项选择题
A.centering
B.concentrating
C.reinforcing
D.promoting
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单项选择题
A.check-inB.check-outC.check-upD.double-check
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
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