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
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
单项选择题
She doesn't talk much, but what she says makes______.
A. sense
B. idea
C. meaning
D. significance
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