The talented boy _________ write lyrics when he was at the age of ten.
A. may                      B. could                   C. must
B
考查情態(tài)動(dòng)詞。根據(jù)when引導(dǎo)的時(shí)間狀語從句可知，應(yīng)該用一般過去時(shí)。May的過去時(shí)是might；can的過去時(shí)是could。句意“那個(gè)有天賦的男孩10歲就可以寫歌詞了�！惫蔬xB。
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