The sea seems to have the best answer . There is a lot of water in the sea. All that needs to be___is to get the salt ou
问题描述：
The sea seems to have the best answer . There is a lot of water in the sea. All that needs to be___is to get the salt out of the sea water.选什么?
A.reported B.reused C.endedD.done
答
d.all that needs to be done 是主语,意思是采取的措施