单项选择题

There is ______ "s" in the word" smile".

A． a
B． /
C． an
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单项选择题
We won’t go to the Great Wall if it ______ tomorrow.
A． rains
B． rain
C． will rain
单项选择题
The workers are ______ strike now.
A． on
B． in
C． at
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