单项选择题

The teacher said that the earth ______ around the sun.

A．turns
B．turned
C．turn
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单项选择题
The ground is covered ______ snow.
A．of
B．by
C．with
单项选择题
The question is ______ difficult that no one in the class is able to give the answer.
A．very
B．so
C．too
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