题目内容

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