They are a kind of ______(book).应该填book还是books [关于kind of的用法]

问题描述:

They are a kind of ______(book).应该填book还是books [关于kind of的用法]
rt 请求顺带说明一下 kind of的用法

填book.如果主语是由限定词+kind of +名词其后的动词形式按以下规则:a/thiskind of后常跟单数和不可数名词,动词用单数,如this kind of man annoys me.相反地如是These/those kinds of后的动词用复数those kinds ...