— Were you at home _________?
— No, I was at school.
A:two days before
B:two days ago
C:before two days
D:ago two days
____
男女同学间的交往是学校生活的一个重要内容,也是很正常的事情,但它要求我们要讲究恰当方式。这种“恰当方式”是( )