We don’t allow in the office. But you are allowed in the open air. A. smoking; smokingB.

问题补充：

We don’t allow in the office. But you are allowed in the open air.

A. smoking; smoking

B. to smoke; to smoke

C. smoking; to smoke

D. smoke; smoking

答案：

A. smoking; smoking

B. to smoke; to smoke

(答案→)C. smoking; to smoke

D. smoke; smoking

解析：这题第一空考查allow doing，第二空考查allow sb to do，句意是：我们不允许办公室抽烟，但你可以被允许在户外抽烟。选C。