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The students didn ’ t manage to work out the problem ______ their teacher had ex
The students didn ’ t manage to work out the problem ______ their teacher had ex
游客
2024-01-14
71
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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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