单项选择题

When she listens to a talk, she likes to sit______.

A． at front
B． in front
C． in front of
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单项选择题
The speaker kept ______ talking until we got bored.
A． on
B． back
C． up
单项选择题
Be careful! Don't get______.
A． your key lose
B． to lose your key
C． your key lost
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