—Hello ! Is that Mr Jiang?  

—No, he           Guiyang. He will be back in more than two weeks.[ ]

A. goes                

B. went  

C. has gone to          

D. has been to

安全期是指

A．排卵前后4～5天内
B．卵子自卵巢排出2天以后
C．本次月经末至下次月经前14天之间
D．月经前16天到月经来潮前
E．排卵日及其前5天，后4天以外的时间