问题
选择题
Mr. Green ____ go to bed ____ he finished his work last night.
A. does; until B. don’t; until C. didn’t; until
答案
答案：C
题目分析：not…until直到……才。Mr. Green是第三人称单数，谓语用单三形式。句意：昨天晚上格林先生直到完成工作才去睡觉。故选C。
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