Children,when ________ by their parents,are allowed to enter

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Children,when ________ by their parents,are allowed to enter the stadium.
A.to be accompanied B.to accompany
C.accompanying D.accompanied
您好!如何选择?理由?什么情况下选：A

【选择】D.accompanied
【解析】
　　本句主体部分是 Children are allowed to enter the stadium,插入的 when___ by their parents 是时间状语..
　　空白处动词的逻辑主语就是句子主语children,无论从意思上还是由介词短语 by 构成的结构上,都应该是被动语态.B 项 to accompany 和 C 项accompanying 分别是不定式和现在分词的主动形式,因此不在选择之列.
　　A 项不定式表示未来的动作,如果选择,等于when children will be accompanied by their parents 的省略,在意思上或时间上都与主句冲突.
　　D 项过去分词的一般式表示与主句谓语动词同时发生的动作,选择此项,等于 when children are accompaniedby their parents,符合题意.

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