单项选择题


A．demonstrate
B．strengthen
C．promote
D．cultivate
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单项选择题
A．sinceB．becauseC．thoughD．however
A．since
B．because
C．though
D．however
单项选择题
A．copeB．associateC．cooperateD．agree
A．cope
B．associate
C．cooperate
D．agree
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