单项选择题

It is no easy job to be a teacher. One has to be extremely patient ______ the students.

A．at
B．about
C．on
D．with
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单项选择题
It is necessary for students to take tests at monthly ______.
A．intervals
B．times
C．periods
D．terms
单项选择题
I have made an ______ for you to see the doctor at eleven this morning.
A．appointment
B．arrangement
C．opportunity
D．assignment
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