单项选择题


A．person
B．people
C．man
D．couple
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单项选择题
A．recognizingB．recognizeC．to recognizeD．recognized
A．recognizing
B．recognize
C．to recognize
D．recognized
单项选择题
A．exchangeB．contactC．communicationD．connection
A．exchange
B．contact
C．communication
D．connection
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