单项选择题

You'd better hurry, （）you might be late for class.

A. or
B. and
C. unless
D. but

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Because cows（）meat and milk, they are valued in many countries.

A. both produce       
B. both product
C. produce both       
D. product both
单项选择题
Turn on TV, and you （）many advertisements every day.

A. see     
B. will see  
C. would see  
D. saw
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