Question

-What's the matter?

-They said I should not be allowed ________ here. They don't allow ________ in the waiting room.

1. A.
   smoking, to smoke
2. B.
   to smoke, smoke
3. C.
   to smoke, smoking
4. D.
   smoking, smoking

Answer 1

C
allow sb．to do=let sb．do，allow后面接表示人的名词或代词作宾语时，或用于被动语态时，后面必须接动词不定式；当allow不带人称代词或名词时，后面的动词必须用-ing形式。