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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