I am surprised to see you not smoking. You .A. are used toB. were used toC. used toD. used

问题补充：

I am surprised to see you not smoking. You .

A. are used to

B. were used to

C. used to

D. used to be

答案：

A. are used to

B. were used to

(答案→)C. used to

D. used to be

解析：be used to sth习惯于某事;used to do sth过去常常做某事. sth be used to do sth某物被用来做某事。句意：看到你不吸烟了，我很吃惊。你过去常常吸烟。结合语境可知选C。