Please listen to the teacher as as you can in class.A. carefulB. carefullyC. carelessD. c

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A. careful
(答案→)B. carefully
C. careless
D. care
解析：考查形容词和副词的用法。句意“上课时，请尽可能的认真听老师讲课。”修饰动词用副词；修饰名词用形容词。listen to是动词短语，用副词修饰，排除A、C、D。故选B。