She is looking after a .
A. five-month-old baby
B. five month old baby
C. five-months-old baby
D. five-years-old baby
网友回答
(答案→)A. five-month-old baby
B. five month old baby
C. five-months-old baby
D. five-years-old baby
解析：英语中的复合形容词的结构是“数字+量词/单位+形容词”，中间用连字符，量词或单位应用单数，根据这一用法，本题应该选A。