—MustIgiveup　　　,Doctor?     —Foryourhealth,youhaveto.  ...

问题详情：

— Must I give up 　　　, Doctor?

      — For your health, you have to.

      A. smoke        B. smoking       C. smokes       D. to smoke

【回答】

B

知识点：动词和动词短语

题型：选择题