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
Under the guidance of their teacher, the pupils are building a model boat ______ by steam:
A．towed
B．tossed
C．propelled
D．pressed
单项选择题
It ______ to me that he was the first person to help us in those difficult times
A．rectifies
B．occurs
C．reminds
D．arises
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