The head of the pany promised to deal with matters of this sort ________ he returned to his office．A.untilB.whileC.by the timeD.the moment
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D解析解析：the moment作为连词使用引导时间状语从句，相当于as soon as。until表示“直到”，不合常理；while作“当……时”讲时，后不接短暂性动词．by the time的主句中常用完成时态，表示已经。