单项选择题

The two delegates had an in-depth exchange of views on how to enhance their cooperation ______.

A．ethical
B．bilateral
C．mandatory
D．subsidiary
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单项选择题
Three weeks after the suicide bombing, the police were still hunting for bombers for they believe more were ______.
A．on the verge
B．on the sly
C．on the spot
D．on the loose
单项选择题
The company will ______ to its agreement, no matter how costly the process may be.
A．retain
B．alter
C．abandon
D．adhere
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