—How long have you been here?

—___ the end of last year．

A．Since

B．At

C．By

D．In

心脏传导阻滞不包括（）

A.房内阻滞

B.干扰与脱节

C.束支与分支阻滞

D.窦房阻滞

E.房室传导阻滞