Mary is a___ girlA、sevenyears old B、seven-years-old C、seven-

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Mary is a
___ girlA、seven
years old B、seven-years-old C、seven-year-old D、seven-year
old 求为什么选这个答案

选C.
Mary is a seven-year-old girl.玛丽是一个七岁的女孩.
数词-year-old 共同组成一个复合形容词,用来形容一个人的年龄,这是固定搭配.
此外还有数词-meter-long 等等其他类似结构的复合形容词.
补充一下：A是错误的,因为seven years old 这样的词组,只能做表语,不能做定语.在这里是不可以的.
再问： Mary is a seven years' old girl. 这个表达有问题吗？
再答：有问题。首先，没有seven years' old 这种说法，只有seven years old 然后，seven years old这个短语，只能作表语，不能作定语。就是说，它可以跟在be动词后面修饰名词，比如Mary is seven years old. 但他不可以直接跟在名词前面修饰名词（即作定语），比如你这个说法Mary is a seven years old girl 就是错误的。

Mary is a___ girlA、sevenyears old B、seven-years-old C、seven- Helen is seven years old. ( ) His danghter is ________.A seven years B seven year old Mary is seven years old now .This autumn she S—— her school. Isn't your brother five years old?-( )He is seven. 英语阅读理解Dick is seven years old, she is seven years old.的同义句是什么? Eve is six years old.Erin is seven years old.合并句子 . Lucy is eight years old.Lily is seven years old. 合为一句话仿照例句写句子例:Mike is seven years old.Jack is nine years old.Who he is seven years old 对划线部分提问划线部分是seven 英语年龄的表达我知道She is seven years old 和She is a seven-year-old gi