单项选择题


A．retained
B．benefited
C．acquired
D．rewarded
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单项选择题
A．contactB．associationC．communicationD．relation
A．contact
B．association
C．communication
D．relation
单项选择题
The carpet __________ easily, so try not to spill anything on it.
A．spots
B．marks
C．stains
D．patches
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