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           to reach them on the phone, we sent an email instead

     A. Fail  B. Failed  C. To fail  D. Having failed

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    _________to reach them on the phone, we sent an email instead.

    A. Fail            B. Failed             C. To fail          D. Having failed

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    _______to reach them on the phone, we sent an email instead.

    A. Fail            B. Failed             C. To fail          D. Having failed

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    Prices reach equilibrium at the level at which quantity demanded ______ quantity supplied.

        A.is equal to       B.equal            C. equals to        D. is equal

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    _________ to reach them on the phone，we sent an email instead．

    　　A．Fail　 　　　　　　　　　　B．Failed

    　　C．To fail　　　　　　　　　　D．Having failed

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