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。