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The sign says that children are admitted only if ________ by an adult.
A.to be accompanied B.accompanying
C.accompanied D.to accompany
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。
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