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
David _________an incident that took place in the family 12 years previously.
A．represented
B．renewed
C．reminded
D．recalled
单项选择题
Any work undertaken on an individual basis should always _________attention on the broader social context in which the individual lives.
A．direct
B．focus
C．adjust
D．center
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