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.

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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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