题目内容：

She was the first girl _____(work) out the problem,to work 还是to have worked?

优质解答

She was the first girl _____(work) out the problem,to work 还是to have worked?填to have worked.因为不定式的完成形式表示【动作发生在谓语动词was的先前】.【先解出了to have worked这道题,才有“第一或第二”...