Question

【题目】Attention, please! Without permission, children are not allowed alone here.

A. to swim

B. swimming

C. swim

D. swam

Answer 1

【答案】A

【解析】

句意：请注意！未经允许，孩子们不能单独在这里游泳。swim代词，游泳；to swim不定式形式；swam过去式。固定搭配allow sb. to do sth.允许某人做某事，动词不定式作宾补；本句为此结构的被动形式。故选：A。