单项选择题

One learns a language be making mistakes and ______ them.

A．correct
B．correcting
C．corrects
D．to correct
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单项选择题
We're going to the bookstore in John's car. You can come with us ______ you can meet us there later.
A．but
B．and
C．or
D．them
单项选择题
The sign reads In case of ______ fire, break the glass and push ______ red button.
A．不填；a
B．不填；the
C．the;the
D．a;a
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