—How old is Tom?—He is .A. fourteen yearsB. fourteen year oldC. fourteen oldD. fourteen

问题补充：

—How old is Tom?

—He is .

A. fourteen years

B. fourteen year old

C. fourteen old

D. fourteen

答案：

(答案→)A. fourteen years

B. fourteen year old

C. fourteen old

D. fourteen

解析：句意：汤姆多大了？他十四岁。对年龄的表示常有两种形式: ①直接用“be+数词”结构；用“be+数词+year(s) old”结构。“十四岁”可表示为be fourteen或be fourteen years old，因此选D。