单项选择题

In the advanced course, students must take objective tests （） monthly intervals.

A. with
B. on
C. for
D. at

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单项选择题
No sooner （） than she realized that she should have remained silent.

A. had the words been spoken
B. the words had been spoken
C. the words had spoken
D. had the words spoken
单项选择题
（） in the earthquake thoroughly, the city has now been rebuilt.

A. Destroying
B. Having destroyed
C. Destroyed
D. To be destroyed
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