2. 专升本
  3. The students didn’t manage to work out the problem______their teacher had explained how.

The students didn’t manage to work out the problem______their teacher had explained how.

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问题 The students didn’t manage to work out the problem______their teacher had explained how.
选项 A、when
B、until
C、unless
D、as
答案B
解析 句意：直到老师解释了这道题的做法，同学们才把它做出来。固定用法题。not…until…表示“直到……才……”。
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