Drunk driving used to occur in our city，but now such cases are rare.A. practicallyB. gene

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A. practically
B. generally
(答案→)C. frequently
D. gradually
解析：
句意为：过去在我们城市，酒驾经常发生，但是现在很少出现了。practically事实上，实际上；generally一般地，通常；frequently频繁地；gradually逐渐地。