We should ()(听老师讲课)carefully in class.

问题描述:

We should ()(听老师讲课)carefully in class.

lishten to the teacher
听谁说话listen to sb, listen是不及物动词,如果接名词,必须加介词to.因为没有特指是哪个老师,所以teacher 前加 the, 表示一类,即为老师