单项选择题

—I'm sorry I can't do it.—______.

A． Not at all
B． You are welcome
C． It doesn't matter
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When she listens to a talk, she likes to sit ______.
A． in front
B． at front
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单项选择题
Many books and newspapers in the world are written ______ English language.
A． in
B． in the
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