It was until last year that he .A. left his home town for a new start 　B. came to realize

问题补充：

It was until last year that he .

A. left his home town for a new start

B. came to realize the importance of leaving English

C. worked as an English teacher at a middle school

D. set out to build a new house of h his own

答案：

A. left his home town for a new start

B. came to realize the importance of leaving English

(答案→)C. worked as an English teacher at a middle school

D. set out to build a new house of h his own

解析：强调句型。注意until引导的句型是肯定的意思其谓语动词应该是延续性动词。