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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