单选题
Not until ______ his shoes did he enter one of the low -ceilinged rooms of the Japanese house. A. did he remove B. he had removed C. had he removed D. he removed
【正确答案】
B
【答案解析】[解析] 本句中until引导从句置于句首，句子进行了倒装“did he enter”，但是until所在的从句不倒装。从句动作remove发生在主句动作enter之前，所以要用过去完成时。