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    “The impact will only grow     Iran’s leaders decide to change course and meet their international obligations,” US Secretary of State Clinton warned．
    A．in case thatB．provided thatC．unlessD．until
    C

    这题考查连词的用法：A． in case that以防，B． provided that 条件是，C.unless  除非D． until直到。句意是：美国国务卿希拉里警告说：“影响会持续增长，除非伊朗领导人改变做法，履行他们的国际义务”，所以选C。
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