单项选择题

The director has been asked to state the company's position, but so far he has refused to _________himself on this issue.

A．perform
B．assign
C．commit
D．undertake
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单项选择题
He now can vote, he can enter into financial contracts, and he is _________to run for public office.
A．attributed
B．entitled
C．credited
D．presented
单项选择题
One of the responsibilities of the Coast Guard is to make sure that all ships _________follow traffic rules in busy harbors.
A．cautiously
B．dutifully
C．faithfully
D．skillfully
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