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When the teacher asked the two boys,they ___ offered a solut

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When the teacher asked the two boys,they ___ offered a solution for the problem.
A.every B.each C.none D.all
请解释下每个的用法有什么区别,
为什么?请说说每一个的用法区别啊!
none:一个也没有
either:两者中的随便一个（都不可）,用于肯定句
neither:两者中的随便一个（都不可以）,用于否定句
all:所有的（可用于2者,也可以用于2者以上的）
each:每个,each强调各别、各个
every:每个,every 强调全部、都
both:两者都可以（只用于2者）
补充:我下面说的皆是名词的变化,而动词的变化是跟名词的变化而走的,知道名词了,动词是一样的啊
none:+单数名词
either:+可以加单数也可以加复数 如果表示两者之间且只有两个物体用单数,表示群用复数
neither:neither...nor...既不也不 可以加单数也可以加复数具体看名词主语啦
Neither shoe fits comfortably.
两只鞋都不合脚.
(两者之中)无一个
Neither of my friends has come yet.
all:加复数
each:加单数
every:加单数
both:加复数
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