单项选择题

You've been talking with David all evening when you ought to be ______ with other guests.

A．blending
B．integrating
C．mingling
D．incorporating
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单项选择题
The negotiations which ______ the signing of the treaty took place over a number of years.
A．preceded
B．prescribed
C．proceeded
D．processed
单项选择题
There was a noisy ______ at the back of the hall when the speaker began his address.
A．interaction
B．irritation
C．disturbance
D．interruption
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