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You cannot be ____ careful when you drive a car.

A. very B. so C. too D. enough

C


解析:

can't too 加形容词表示"越……越好;……都不为过"。

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D

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The symptoms of swine flu are similar to the common flu.They include fever, lethargy (无精打采), lack of appetite, coughing, runny nose, sore throat, nausea(恶心), and vomiting (呕吐).The high proportion of young adults among the deaths is one of several mysteries about this virus.Most of the dead had lung damage.What caused it is not yet known.

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There are medicines to treat swine flu.Doctors suggest using anti - viral drugs.They keep the virus from reproducing inside the body.

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