单项选择题

Go to your dentist before decay of the teeth ________.

A．sets in
B．sets off
C．sets on
D．sets up
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单项选择题
Johnny had difficulty in learning English but he finally passed CET (Band 4) at the third ________.
A．attempt
B．display
C．process
D．trial
单项选择题
________ the government agrees to give extra money, the theater will have to close.
A．Lest
B．If
C．Provided
D．Unless
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