问题
选择题
－Where did you go _____ the morning of April 6?
－I didn’t come to the office _____ the meeting was over.
A．in, when
B．at, unless
C．on, until
D．to, though
答案
答案：C
确指某天的上午、下午或晚上时要用介词on not…until固定结构。
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