单项选择题

Don’t worry me now, I will mend that coat

A．by and by
B．off and on
C．back and forth
D．now and then
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He used to get up late, （）

A. did not he
B. did he
C. didn't he
D. use he
单项选择题
The business of doctors is to prevent and（）disease.

A. kill
B. cure
C. wound
D. injure
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