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    25．-We had better ask Bob to help us. ▲ he is away on business.A. So B. And C. Or D. But 【查看更多】

     

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    We had better ask Bob to help us. _______ he is away on business.

    [     ]

    A. So
    B. And
    C. Or
    D. But

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    －We had better ask Bob to help us．

    －________ he is away on business．

    [　　]

    A．So

    B．And

    C．Or

    D．But

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