单项选择题

It's no use ______ me not to worry.

A．you tell
B．your telling
C．for you to have told
D．having told
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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
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
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