The students didn ’ t manage to work out the problem ______ their teacher had ex

游客2024-01-14 111

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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