单项选择题

Some of them（） here for three days.

A. have arrived
B. have got
C. have reached
D. have been

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单项选择题
You'd better hurry, （）you might be late for class.

A. or
B. and
C. unless
D. but
单项选择题
Because cows（）meat and milk, they are valued in many countries.

A. both produce       
B. both product
C. produce both       
D. product both
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