单项选择题

Mary ______ that piece of cake for twenty yuan.

A．spent
B．cost
C．bought
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单项选择题
It ______ heavily so there was deep snow on the road.
A．snows
B．snowed
C．had snowed
单项选择题
The bus ______ yesterday.
A．repaired
B．is repaired
C．was repaired
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