— 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  

下列哪些是法洛四联征的主要临床表现()

A.青紫

B.顽固性心力衰竭

C.杵状指

D.脑缺氧发作

E.蹲踞动作