They had talked only for a few minutes ________ they found they were of different opinions. ( 章节：3 难度：2)_做题室

单项选择题They had talked only for a few minutes ________ they found they were of different opinions. ( 章节：3 难度：2): A、unless; B、while; C、before; D、once

正确答案：C
答案解析：
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