Maybe if I had stdied science,not literature four years ago I would be able to give more help.虚拟语气中if引导的从句所描述的事情如果是与过去的事实相反,用过去完成时,所以studied前面要加上had.这句话的主...如果没有交通堵塞，我就能早点到公司了。
if___ ___ ___no traffic jams.I would have got to the company earlier.there had been