单项选择题

Not until I arrived at the gate of school () back.

A. he had turned
B. he didn't turn
C. that he turned
D. did he turn

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You'd better () that next time.

A.not to say
C.not said
B.not saying
D.not say
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It is everybody's () to keep the city clean.

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