单项选择题

It is necessary for students to take tests at monthly ______.

A．intervals
B．times
C．periods
D．terms
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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
单项选择题
You ______ her at the beginning, but now it is too late.
A．ought to refuse
B．have ought to refuse
C．ought to have refused
D．ought have refused
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