题目内容：
They had talked only for a few minutes ________ they found they were of different opinions.
（4.0分）4.0 分
A、
while
B、
before
C、
once
D、
unless
参考答案：
选择题：They had talked only for a few minutes ________ th
- 题目分类：郑州航空工业管理学院-土木工程-公共英语（3）
- 题目类型：选择题
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They had talked only for a few minutes ________ they found they were of different opinions.
（4.0分）4.0 分
A、
while
B、
before
C、
once
D、
unless