单项选择题

The ground is covered ______ snow.

A． of
B． by
C． with
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单项选择题
The story is not good at all, so it's not worth ______.
A． to read
B． to be read
C． reading
单项选择题
There are some ______ on the glass.
A． drops of waters
B． drops water
C． drops of water
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