Question

I didn’t manage to work out the problem ______ their teacher had explained how.

答案为until 拜求详解.

Answer 1

1.这道题考查了“not ... until 直到...才...”的用法。
2.题意：直到老师解释如何接这道题时，我才把它做出来。
3.词组学习：manage to do sth.(成功做成某事）
4.。。。their teacher had explained how（to work out the problem ）---省略！

Answer 2

not ... until 直到...才...

Answer 3

根据题意可知：直到老师解释如何接这道题时，我才把它做出来。