单项选择题


A．attentive
B．interesting
C．effective
D．difficult
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单项选择题
A．appointedB．assignedC．imposedD．based
A．appointed
B．assigned
C．imposed
D．based
单项选择题
A．proceedingB．developmentC．processD．advance
A．proceeding
B．development
C．process
D．advance
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