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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单项选择题
When one is unfamiliar with the local customs, it is easy to make a______.
A．blame
B．blunder
C．commitment
D．fault
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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