翻译题

Had I studied educational psychology, ____（我昨天就知道怎样吸引学生注意力了）.

【正确答案】

I would have known how to attract students’ attention yesterday.

【答案解析】

虚拟语气，形如 Had I -v.ed(过去分词)…, I would/could/might have -v.ed…