分类：教育/科学-外语学习-英语考试
问题：hehasdonewhathecantohelpus1.Heha 
1.He has done what he can to help us.
2.he has done what he can do to help us.
哪个对？ 求详解。
回答：都是对的。第二句是第一句的省略形式。