单项选择题

There are some trees on ______ side (s) of the street.

A． both
B． every
C． either
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单项选择题
There are a lot of spelling mistakes in your compositon. You should have been more ______.
A． carefully
B． careless
C． careful
单项选择题
Catherine is not happy, because she doesn't know ______ next.
A． to do what
B． what to do
C． which to do
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