－Where did you go the morning of April 6?－I didn’t come to the office the meeting was ov

－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

A. in, whenB. at, unless(答案→)C. on, untilD. to, though解析：确指某天的上午、下午或晚上时要用介词on not…until固定结构。

我检查一下我的答案