A small child should not be allowed into the swimming pool unles

A small child should not be allowed into the swimming pool unless _______ by an adult.
A、accompany
B、to accompany
C、accompanied
D、accompanying
【正确答案】：C
【题目解析】：译文：除非有成人陪伴否则小孩不允许进入游泳池。本题考查省略句式。该句话用被动语态，此句省略了he was...。答案为C。