There many people in the office, but now nobody is allowed to.
A. used to be；smoking
B. used to have；smoking
C. used to be；smoke
D. used to have；smoke
网友回答
(答案→)A. used to be；smoking
B. used to have；smoking
C. used to be；smoke
D. used to have；smoke
解析：考查动词。本题考查there be句型及be used to doing习惯于做某事，选A。