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    1．在助动词或情态动词之后.如be going to, used to, have to, ought to, be able to, be about to等. She must go but you don't have to. 她必须走.但你没有必要. ---Do you think I ought to go to see my doctor 你认为我应该去看医生吗? ---Yes, I think you ought to. 是的.我想你应该去. 【查看更多】

     

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