问题补充:
—I want to know your son is.
—He is ten years old.
A. how much
B. how old
C. how long
D. how many
答案:
A. how much
(答案→)B. how old
C. how long
D. how many
解析:根据回答他十岁了,可知上句在问你的儿子多大了。A. how much多少,提问不可数名词的量B. how old 多大,问年龄 C. how long 多久D. how many多少,提问可数名词的量。根据句意,故选B。