—Could I speak to Mr Smith, please?

— _____. I'll go and ask him to answer the call.[ ]

A. Please hold the line            

B. Please hang off    

C. Sorry, he isn't here now      

D. Sorry. I'm afraid you have the wrong number

使用短效口服避孕药开始服第一片的时间一般为()。

A．月经来潮前第5天

B．月经来潮的第5天

C．月经来潮的第10天

D．月经干净后第5天

E．性交前8小时