—is your grandmother?—She is 80years old.A. HowB. How oldC. How manyD. What

问题补充：

—is your grandmother?

—She is 80years old.

A. How

B. How old

C. How many

D. What

答案：

A. How

(答案→)B. How old

C. How many

D. What

解析：句意：——你的祖母多大岁数了？——她80岁了。how old询问年纪多大了，how询问怎么样，how many询问数量多少，what询问什么。故选B。