The little boy is only _____ A.five year old          B.five-year-oldC.five-years-old        D.five old填选项里的 

问题描述:

The little boy is only _____
 A.five year old          B.five-year-oldC.five-years-old        D.five old填选项里的 

C

b

答案是B ,原因如下:
A中year应改成years,就可选了
C中years改为year,就可选了
D就不用说了把,这个却少year这个单词了,你可以去查查语法书,带横杠的是不需要加“s”的,而不加横杠的是要加“s”的