单选题When did Billy begin teaching himself computer programming?AWhen he was 7 years oldBWhen he was in Grade 5CWhen he was in high schoolDWhen he was at university
单选题
When did Billy begin teaching himself computer programming?
A
When he was 7 years old
B
When he was in Grade 5
C
When he was in high school
D
When he was at university
参考解析
解析：
由第五段中的“He began teaching himself computer programming when he was just seven years old”可知，他七岁的时候开始学习电脑编程，因此选A项。
由第五段中的“He began teaching himself computer programming when he was just seven years old”可知，他七岁的时候开始学习电脑编程，因此选A项。
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