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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填空题

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.

单项选择题

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.