boys and girls are_____stay in class.A.both B.all请问是A还是B,请说明理由Girls and boys________ often have a walkman,a mobile phone.填all 还是both能不能把girls，boys是看做两种人，填both?

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boysandgirlsare_____stayinclass.A.bothB.all请问是A还是B,请说明理由Girlsandboys________oftenhaveawalkman,amobil

boys and girls are_____stay in class.A.both B.all请问是A还是B,请说明理由Girls and boys________ often have a walkman,a mobile phone.填all 还是both能不能把girls，boys是看做两种人，填both?
boys and girls are_____stay in class.
A.both B.all
请问是A还是B,请说明理由
Girls and boys________ often have a walkman,a mobile phone.
填all 还是both
能不能把girls，boys是看做两种人，填both?

boys and girls are_____stay in class.A.both B.all请问是A还是B,请说明理由Girls and boys________ often have a walkman,a mobile phone.填all 还是both能不能把girls，boys是看做两种人，填both?
B all
both一般情况下是指两个人或两方面.
而这里的着重点是全部同学,因此要用all.
PS.你的第二个问题.选both
在这句话中,就是要将男孩和女孩看作双方,当两个独立的整体人群来讲.often在这里是关键词,有了它,就表示并不是所有的人都有随身听和手机.all特别是指明的全部,每一个,因此在这里不可以用all.
再PS.其实这两个句子都不单只是在书面上常见的句型,在口语中用得也十分普遍,该选哪一个,读一遍就已经十分清楚了.

B.all
boys>2
girls>2
boys and girls >4
三者以上所以all

B

B all
both是两个人

all
both是两个人啊

B吧，both一般指两个事物之间，而题中男孩们和女孩们都是复数，不算两个

all

A
虽然这里是复数，boys和girls是两个类别

A
both
boys是一类
girls是另一类

问题错了
没有 are _(both, all)__ stay in class 这样的， 病句

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