单项选择题

Tom lived in a northern city ______.

A．at some time
B．in the time
C．for one time
D．at one time
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单项选择题
It gets ______ when summer comes.
A．warmer and warmer
B．cooler and cooler
C．hotter and hotter
D．hot and hotter
单项选择题
The library needs ______, but it'll have to wait until Sunday.
A．cleaning
B．be cleaning
C．clean
D．being cleaned
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