—Can I smoke here?—Sorry.We don’t allowhere.A. people smokingB. people smokeC. to smokeD.

问题补充：

—Can I smoke here?

—Sorry.We don’t allowhere.

A. people smoking

B. people smoke

C. to smoke

D. smoking

答案：

A. people smoking

B. people smoke

C. to smoke

(答案→)D. smoking

解析：allow后接动词-ing形式作宾语,表示允许做某事。