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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An hour later the visiting parents assembled in the school hall.
A．stood
B．gathered
C．huddled
D．lined
单项选择题
We must make up an excuse for being late.
A．invent
B．produce
C．create
D．investigate
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