______, he went to Australia to study English.
A．When a boy of 12B．He was 12 years old
C．When he was the age of 12D．When was 12
A
考查省略。當(dāng)主句和從句的主語(yǔ)一致，而從句又是主語(yǔ)+be動(dòng)詞的形式，這時(shí)從句的主語(yǔ)和be動(dòng)詞可以省略。故When a boy of 12 =" When" he was a boy of 12，故選A。     
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