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    It is such a modem machine ____few of the workers know how to operate it.
    A．whichB．thatC．asD．the one
    B
    考查定语从句。such修饰先行词时，定语从句引导词用that或as。当从句不缺少成分时，用that，从句缺少成分时，用as作主语或宾语。句意“它是一台如此时新的机器，以至于这些工人中几乎没有人会操作它。”从句不缺少成分，用that。故选B。
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