填空题

When he got off，he found that he took the wrong train． He didn’t find that he took the wrong train ______ he got off．

【参考答案】

until

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He was so happy to go home that he couldn’t sleep on the train．He was ______ happy to sleep on the train because he was going home．

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