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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
参考答案
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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