单项选择题

Now that you are seriously ill, you'd better stop ______.

A． smoking
B． to smoke
C． smoke
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单项选择题
The first underground railway in Shanghai ______ in 1994.
A． was setted up
B． was set up
C． set up
单项选择题
Be careful when you cross the street.______.
A． Yes, I will
B． Yes, I can
C． Yes, I am
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