单项选择题

More thunderstorms ______in summer than any other time of the year.

A．happened
B．have happened
C．happen
D．will happen
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单项选择题
As a result of careless washing the jacket ______to a child''s size.
A．compressed
B．shrank
C．dropped
D．decreased
单项选择题
The new currency will get into ______soon.
A．circuit
B．circulation
C．circular
D．circle
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