问题
选择题
_______ the age of four, he started to learn the piano. [ ]
A. On
B. With
C. At
D. In
答案
答案：C
搜题请搜索小程序“爱下问搜题”
_______ the age of four, he started to learn the piano. [ ]
A. On
B. With
C. At
D. In
答案：C