Question

______, he went to Australia to study English.

A．When a boy of 12	B．He was 12 years old
C．When he was the age of 12	D．When was 12

Answer 1

A

考查省略。当主句和从句的主语一致，而从句又是主语+be动词的形式，这时从句的主语和be动词可以省略。故When a boy of 12 =" When" he was a boy of 12，故选A。