单项选择题

Some bacteria______extremely harmful, but______are regularly used in producing cheeses, crackers and many other foods.

A．is: the others
B．has been: the others
C．are: others
D．have been: others
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单项选择题
It was once a very prosperous part of the city, but now many of the businesses have moved away or gone______.
A．bankruptcy
B．bankrupt
C．bankrupted
D．to bankrupt
单项选择题
______your timely advice, I would never have known how to deal with the tough job.
A．But for
B．Except for
C．Not until
D．Prior to
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