单项选择题

A．rate
B．thickness
C．proportion
D．density
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单项选择题
A．The professor will change his mind.B．The professor may change his mind.C．It’s better not to make the professor angry.D．The professor wouldn’t have changed his mind.
A．The professor will change his mind.
B．The professor may change his mind.
C．It’s better not to make the professor angry.
D．The professor wouldn’t have changed his mind.
单项选择题
A．competentB．competitiveC．aggressiveD．effective
A．competent
B．competitive
C．aggressive
D．effective
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