---People are not allowed in the cinema.
---But they will allow in the restroom.
A. to smoke; smoke
B. smoking; to smoke
C. to smoke; smoking
D. smoking; smoke
网友回答
A. to smoke; smoke
B. smoking; to smoke
(答案→)C. to smoke; smoking
D. smoking; smoke
解析：be allowed to do sth，表示允许某人做某事，而allow doing sth，表示允许做某事，故选C