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    【题目】I have to start off early every day ______ I can catch the train.

    A. unless B. since C. as soon as D. so that

    【答案】D

    【解析】试题分析：句意：为了能赶上火车我必须每天很早出发。 A. Unless除非；B. Since自从；C. as soon as一……就……；D. so that为了。根据句意及语境此题应选D。

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