Do you have any idea when the probllem was settled?It was not until last Friday ______ we had a chance to discuss it thoroughly.A.that B.when为什么答案给的是B

我是结合你给的答案，觉得大致是这样吧：
-你知道这问题啥时候解决的吗？
-上周五我们有机会仔细讨论了一下，这才解决。
主干就是it was not until last friday, when引导状语从句修饰这个Friday，详细说明这个friday发生了什么以致于这个问题得到了解决。

Do you have any idea when the probllem was settled？
It was not until last Friday ______ we had a chance to discuss it thoroughly.
A.that B.when
选A
因为It was not ... that ...是一个强调句型
It was not until last Friday .that we had a chance to discuss it thoroughly.= we did not have a chance to discuss it thoroughly.until last Friday.

B .这是对 状语强调 的强调句型 主句省略了.
原句 =it was not until last Friday when we had a chance to discuss it thoroughly .
that the probllem was settled.
= the probllem was not settled until last Friday when we had a chance to discuss it thoroughly .

选择 A 这是it was not until.... that 的强调句,是固定句型, 翻译:直到上周五,我们才有机会彻底的解决它,