单项选择题

All games______ because of the rainstorm, many students could do nothing but study in the classroom.

A．were canceled
B．having been canceled
C．had been canceled
D．have been canceled
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单项选择题
The problem of environment protection has been studied______.
A．extremely
B．intensively
C．originally
D．violently
单项选择题
We all hope he'll soon______ his disappointment and be happy again.
A．get through
B．get away
C．get up
D．get down
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