It took him only ten minutes to work out the maths problem.(保持愿意基本不变)
问题描述：
It took him only ten minutes to work out the maths problem.(保持愿意基本不变)
He _____only ten minutes____out the maths problem.
答
He takes only ten minutes working out the maths problem.不是过去式吗楼下的是对的,过去式，抱歉。spent working.