单项选择题

The morning class ______over, students rushed out of the classroom for lunch.

A．was
B．is
C．having been
D．being
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单项选择题
Loudspeakers were fixed in the hall so that everyone ______an opportunity to hear the speech.
A．ought to have
B．must have
C．may have
D．should have
单项选择题
We should always bear in mind that decisions often result in ______conclusions.
A．urgent
B．instant
C．prompt
D．hasty
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