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
Although punctual himself, the professor was quite used ______ ate for his lecture.
A．to have students
B．for students' being
C．for students to be
D．to students' being
单项选择题
______ all our kindness to help her, Sara refused to listen.
A．At
B．In
C．For
D．on
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