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    The letter “X can be used an unknown number. A. to expressing B. to express C. expressing D. expression 【查看更多】

     

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    The letter “X” can be used ________ an unknown number.

    A. to expressing     B. to express     C. expressing     D. expression

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    The letter “X” can be used ________ an unknown number.

    A. to expressing B. to express　　 　 C. expressing　　 D. expression

     

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    The letter“X”can ________ an unknown number．

    [　　]

    A．be used to express

    B．be used to expressing

    C．use to express

    D．use for expressing

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     The letter “X” can _______ an unknown number

          A be used to express        B be used to expressing

          C use to express           D use for expressing

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