He______________be hungry一he's just had lunch.A. can'tB. mustC. ought toD. might

题目

He______________be hungry一he's just had lunch.

A. can't

B. must

C. ought to

D. might

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更多“He______________be hungry一he's just had lunch. A. can't B. must C. ought t ”相关问题

  • 第1题：

    A: I saw Tom just now at the café

    B:It ( )be him. He went to U.S.A. yesterday.

    A. mustn't

    B. can't

    C. shouldn't


    正确答案：B

  • 第2题：

    ---- Look! The man at the gate ________ be our headmaster. He is always standing there every morning.

    --- - No, it ________ be him. He is holding a meeting in the office now.

    A.must, can’t B.must, mustn’t C.can’t, can’t D.can’t, mustn’t


    正确答案：A

  • 第3题：

    以下元组演算公式与关系代数R È S、R - S、 R Ç S的等价性相对应的一组是_________。

    A．{ t | tÎR Ú tÎS } 、{ t | tÎR Ù tÏS } 、{ t | tÎR Ù tÎS }

    B．{ t | tÎRÙ tÎS } 、{ t | tÎR Ù tÏS } 、{ t | tÎR ÚtÎS }

    C．{ t | tÎR Ú tÏS } 、{ t | tÎR Ù tÎS } 、{ t | tÎR Ù tÏS }

    D．{ t | tÎR Ù tÎS } 、{ t | tÎR Ú tÎS }


    C

  • 第4题：

    —_______ I return the book to the library this week?— No, you _______.You can keep it until the end of this month.

    A.Must; needn’t

    B.Can; can’t

    C.May; mustn’t

    D.Can; mustn’t


    答案：A

  • 第5题：

    3．—__________ 1 go out for a while?

    —No，you __________ You must finish your homework first．

    A． Must，needn't

    B． Can，may

    C． May，mustn't

    D． May，must


    正确答案：C

  • 第6题：

    15、以下元组演算公式与关系代数R È S、R - S、 R Ç S的等价性相对应的一组是_________。

    A．{ t | tÎR Ú tÎS } 、{ t | tÎR Ù tÏS } 、{ t | tÎR Ù tÎS }

    B．{ t | tÎRÙ tÎS } 、{ t | tÎR Ù tÏS } 、{ t | tÎR ÚtÎS }

    C．{ t | tÎR Ú tÏS } 、{ t | tÎR Ù tÎS } 、{ t | tÎR Ù tÏS }

    D．{ t | tÎR ÚtÏS } 、{ t | tÎR Ù tÎS } 、{ t | t&Ici


    B

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