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    The problem is quite easy. So I think there no trouble. A. to be B. be C. ought be D. ought to be 答:D.为therebe句型与情态动词连用. 【查看更多】

     

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    The problem is quite easy. So I think there________ no trouble.

    A. to be　　　 B. be　　

    C. ought be 　D. ought to be

     

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