—What do you mean saying “The boy is overgrowing”?— I mean that he is tall his age.A. by

问题补充：

—What do you mean saying “The boy is overgrowing”?

— I mean that he is tall his age.

A. by; for

B. as to; for

C. about; with

D. by; to

答案：

(答案→)A. by; for

B. as to; for

C. about; with

D. by; to

解析：考查固定句型，be tall for his age意思“按年龄说长的偏高”， What do you mean by意思“你…是什么意思”，所以选A