“人而无信，不信其可也”告诉我们诚信是金。做一个讲诚信的人应该[ ]

①真诚待人  ②友善待人   ③幽默待人   ④随和待人

A．①② 

B．②③ 

C．③④ 

D．①④

— Could you please tell me 　　　　?

— In three days.

A．when will your course start

B．when your course will start

C．when your course started

D．when did your course start