The sign says that children are admitted only if ________ by an adult.
A．to be accompanied　B．a(chǎn)ccompanying
C．a(chǎn)ccompanied　D．to accompany
C
句意：牌子上寫著，兒童必須有成年人陪同方可入場(chǎng)。這里其實(shí)是狀語從句的省略，省略了children are或they are。accompany與children之間是動(dòng)賓關(guān)系，所以應(yīng)用v.­ed形式。
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