Question

—May I smoke here，please?
—I am afraid you           ．This is a non-smoking area．

1. A.
   can
2. B.
   can’t
3. C.
   may
4. D.
   may not

Answer 1

B
本题考查情态动词。由This is a non-smoking area．“这是无烟区”可知“不能”在这里吸烟，故答案选B。