单项选择题

It is everybody's（）to keep the city clean.

A. matter
B. affair
C. business
D. thing

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单项选择题
—I'm going to the post office. —（）you axe there, can you get me some stamps

A. As
B. While
C. Because
D. If
单项选择题
No matter what you say, I shall（）my opinion.

A. carry out
B. keep up
C. insist on
D. stick to
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