The talented boy write lyrics when he was at the age of ten. A. may B. could C. must

问题补充：

The talented boy write lyrics when he was at the age of ten.

A. may B. could C. must

答案：

解析：考查情态动词。根据when引导的时间状语从句可知，应该用一般过去时。May的过去时是might；can的过去时是could。句意“那个有天赋的男孩10岁就可以写歌词了。”故选B。