every boy and girl作主语和every boy and every girl作主语谓语动词的数一样吗后面的肯定用单数，但前面的就搞不清楚了~

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• 2个从句的习题.1.A body of volunteers____to aid the helpless in their struggle for survivalA.has been organized B has organizedC have been organized D have organizedA 为什么用单数?为什么是被动?求翻译2.No boy and no girl____admitted to enter the roomA.is B are C has D have been 首先根据：当and连接的复合主语都为单数且前面被no,each,every,many a ,more than one/a等修饰时,常当作单数来看待,其后面的谓语用单数形式.然而,如果在复合主语中,其中一个是表示肯定意义,而另一个表示否定意义,其谓语动词须与肯定的主语保持一至.boy和girl 是单数,且后面有个admitted那前面应该接has答案怎么是A
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