单项选择题

By the treaty each country _________itself to assist the other in case of war.

A．carried
B．guaranteed
C．assured
D．pledged
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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
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
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