Though smoking is not allowed in the public places many people are still in habit of sm

问题补充：

Though smoking is not allowed in the public places, many people are still in habit of smoking in the train or bus in public.

A. the；the

B. /；/

C. the；a

D. the；/

答案：

A. the；the

B. /；/

C. the；a

(答案→)D. the；/

解析：in the habit of “有……的习惯”是固定结构；in public“公开地，公然地”，也是固定结构。