The doctor says that you will end up in hospital you go on smoking like that.A. unlessB.

问题补充：

The doctor says that you will end up in hospital you go on smoking like that.

A. unless

B. if

C. because

D. until

答案：

A. unless

(答案→)B. if

C. because

D. until

解析：unless除非，如果不； if是否，如果； because因为；until直到。句意：医生说，如果你继续那样吸烟，你将会在医院内结束你的生命。结合语境可知选B。