if he had worked hard at high school ,he would be a college

if he had worked hard at high school ,he would be a college If I had worked hard at school,I would be an engineer,too.与I If I had worked hard at school,I would be an engineer,too. If he had worked hard____. （ ）,he would have passed the exam.A.If he studied hard B.Had if he had worked harder,he would have succeeded,这里为什么要用would He got high marks .It was all ___he had worked hard.填什么? He worked hard he got high marks in this exam Stave said that if he had known how it worked,he would have if i had worked hard,i would have succeed Mr.Smith worked in a small town s___he left college.He had h He worked hard at English_____,he medegreat progress.