单项选择题

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

A．with
B．for
C．on
D．at
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单项选择题
______ in the earthquake thoroughly, the city has now been rebuilt.
A．Destroying
B．Destroyed
C．Having destroyed
D．To be destroyed
单项选择题
I would have gone shopping with you, but I ______ so tired that I went to bed quite early.
A．were
B．was
C．had been
D．have been
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