当以that指代某物时,如：he is a boy that can sing （他是一个能唱歌的男孩）此时that定的
当以that指代某物时,如：he is a boy that can sing （他是一个能唱歌的男孩）此时that定的是a boy单数
若换成they are boys that can sing 或者是they are boys there can sing .
若换成they are boys that can sing 或者是they are boys there can sing .
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they are boys that can sing 可以.
that后和boys保持一致,除了加了the only one之类的限定是例外.
that后和boys保持一致,除了加了the only one之类的限定是例外.
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