—May I come in? I’m sorry I’m late. 

—Come in, please. But could you tell me         ?

A．how do you come to school

B．what were you doing then

C．who you talked with

D．why you are late

向群体学员传授单一课程内容适合用（）。

A、讨论法

B、视听法

C、实物示教法

D、讲授法