单项选择题

It was not long ______ the rain stopped and the bright sun came out again.

A. that
B. ago
C. before
D. until
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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
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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