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didn't leave his office-----he finished his homework ----填（） a since b until 理由也要

分类: 作业答案 • 2021-12-19 11:46:55

问题描述：

didn't leave his office-----he finished his homework ----填（） a since b until 理由也要

答

B,not until是直到…才的意思!since加过去时一般表完成时,