单项选择题

You'd better keep the windows ______. It's so hot here.

A．open
B．opening
C．opens
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单项选择题
I have two ______.
A．breads
B．bread
C．pieces of bread
单项选择题
He was ______ tired ______ he couldn't go on working.
A．too; to
B．such; that
C．so; that
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