1 . You________so slowly. I just needed a few seconds to get used to your voice.

A．shouldn’t speak	B．couldn’t have spoken
C．don’t have to	D．needn’t have spoken

2 . —It’s really tiring for me to stand in the queue for three hours to get the G-train ticket.
—You _______. You could have got one online.

A．mustn’t have

B．shouldn’t have

C．can’t have

D．needn’t have

3 . Since you have made such good preparations，there         be any problem about passing the coming exam.

A．mustn’t	B．daren’t
C．shouldn’t	D．needn’t