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。

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