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

Our students are free to study () interests them.

A. that
B. which
C. whatever
D. anything

单项选择题

I don't know whether it will rain or not, but if it rain, I shall stay at home.()

A. does
B. did
C. will
D. shall

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