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    -It had been raining for four days when they arrived at the oil field. -Things easy for them . A. can't be B. shouldn't be C. mustn't have been D. couldn't have been 【查看更多】

     

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    －It had been raining for four days when they arrived at the oil field．

    －Things ________ easy for them then．

    [　　]

    A．can’t be

    B．shouldn’t be

    C．mustn’t have been

    D．couldn’t have been

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