The little girl wrote a _____letter to heraunt.Afive-hundrend-word Bfive-undred-words为什么选A不选B,word是可数名词啊!

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The little girl wrote a _____letter to heraunt.
Afive-hundrend-word Bfive-undred-words
为什么选A不选B,word是可数名词啊!

此处将几个当词用连字符连接,构成只可做定语的一个形容词,如15岁的男孩表达为fifteen-year-old boy,year为可数但必须使用单数,这是英语的特殊结构,只要是这种形容词就必须不出现复数.但此种形容词不可作表语,如He is fifteen-year-old.这是错的,只能说He is fifteen years old.

加上连字符就不用复数了,不加的时候用。如,a nine-year-old boy , a nine years old boy

five-hundred-word是用作形容词的

five-hundrend-word作定语,相当于一个形容词,你见过adj加后缀s的吗?