问题
选择题
The sign says that children are admitted only if ________ by an adult.
A．to be accompanied
B．accompanying
C．accompanied
D．to accompany
答案
答案：C
句意：牌子上写着，儿童必须有成年人陪同方可入场。这里其实是状语从句的省略，省略了children are或they are。accompany与children之间是动宾关系，所以应用v.ed形式。