单项选择题

The staff of the company are always courteous and helpful.

A．efficient
B．respectable
C．well-informed
D．respectful
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单项选择题
It was hard to say why the man deserved such shabby treatment.
A．unforgettable
B．unbelievable
C．unfair
D．unthinkable
单项选择题
We all think that the new device he has proposed is ingenious.
A．effective
B．clever
C．implausible
D．original
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