单项选择题


A．recognizing
B．recognize
C．to recognize
D．recognized
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单项选择题
A．exchangeB．contactC．communicationD．connection
A．exchange
B．contact
C．communication
D．connection
单项选择题
A．beforeB．becauseC．whileD．if
A．before
B．because
C．while
D．if
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