It’s important us students carefully in class.
A. for; listening
B. of; listen
C. for; to listen
D. of; to listen
网友回答
A. for; listening
B. of; listen
(答案→)C. for; to listen
D. of; to listen
解析：
试题分析:强调句式， It is adj for sb to do sth，做某事对某人来说怎么样。本句中it是形式主语，指代后面不定式内容做形式主语，句意：在课堂上认真听讲对学生们来说很重要。结合语境可知选C。