--Mike, can you tell us something about our new teacher?

-- Oh, sorry. I know nothing because I _____________ him before.

A．saw

B．didn’t see

C．have seen

D．haven’t seen

长效口服避孕药是

A．复方炔诺酮

B．甲地孕酮

C．复方甲基炔诺酮甲片

D．炔诺酮

E．复方氯地孕酮