2. 外语
  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 固定句型用法题。not…until…表示“直到…才…”。
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