— Hello, I ____ you ____ in London, how long have you been here?  

— I came here last week. [ ]

A. don't know; were    

B. didn't know; were

C. haven't known; are  

D. hadn't known; are  

心脏按压时，按压部位及抢救者双手的摆放是（）

A.两肋弓交点上两横指，双手平行叠放

B.两肋弓交点上两横指，双手垂直叠放

C.胸骨左缘两横指，双手平行叠放

D.胸骨左缘两横指，双手垂直叠放

E.心前区，双手垂直叠放