George bought a ticket for ＄ 30 and got on the train. George ______ ＄ 30 for a ticket before he got on the train.

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问题 George bought a ticket for ＄ 30 and got on the train.
George ______ ＄ 30 for a ticket before he got on the train.

选项

答案until

解析此句是考查“not…until”，即：“直到…时候才…”引导时间状语从句的句型结构，此处的not并非否定含义，而只是起到了间架结构的作用，与时间状语从句的连词when表达了同样的含义，所以答案为：He didn’t find that he took the wrong train until he got off．

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本试题收录于：公共英语一级笔试题库公共英语（PETS）分类