“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

這題考查連詞的用法：A． in case that以防，B． provided that 條件是，C.unless  除非D． until直到。句意是：美國國務(wù)卿希拉里警告說：“影響會持續(xù)增長，除非伊朗領(lǐng)導(dǎo)人改變做法，履行他們的國際義務(wù)”，所以選C。
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