单项选择题

Air, or ______ is called atmosphere, surrounds the whole earth.

A．it
B．that
C．which
D．what
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单项选择题
You could have done much better yesterday. Why ______
A．didn't you
B．couldn't you
C．hadn't you
D．shouldn't you
单项选择题
Television makes us better ______than ever before.
A．inform
B．informing
C．informed
D．to be informed
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