第17题: [单项选择]The head of the company promised to deal with matters of this sort ______ he returned to his office. A. until B. while C. by the time D. the moment 参考答案:D 答案解析:[考点] 时间状语从句 [解析] until意为“直到”,不合题意;while意为“当……时候”,后面应接延续性动词;by the time一般与过去完成时连用;the moment意为“一