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    Where have you been all these days? We are very _____ about your safety.

    A. interested
    B. frightened
    C. surprised
    D. concerned
    D
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    科目：高中英语 来源：0119 期中题 题型：单选题

    Where have you been all these days? We are very _____ about your safety.
    [     ]
    A. interested
    B. frightened
    C. surprised
    D. concerned

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