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
The workers are ______ strike now.
A．on
B．in
C．at
单项选择题
Betty was ______ all sorts of terrible things that might happen to her if she were left alone in the mountain.
A．imagining
B．guessing
C．supposing
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