问题补充：
No one is allowed in the classroom.
A. smoking
B. smoke
C. smoked
D. to smoke
答案：
A. smoking
B. smoke
C. smoked
(答案→)D. to smoke
解析：本题的含义是没人被允许在课堂上抽烟，允许某人做某事可用allow sb to do sth，故本题选D。
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