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Last night we _ back until the teacher left school.a went b

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Last night we _ back until the teacher left school.a went b didn't c.haven't d wouldn't
选b,但要改为:didn't go
[昨天晚上我们直到老师离开学校才回去.]
原因很简单,时间是last night(昨晚),是具体的过去时间,只能用一般过去时,排除c,d.而且,要掌握“not…until…(直到……才……)”,所以排除肯定式a