【題目】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】試題分析：句意：為了能趕上火車我必須每天很早出發(fā)。 A. Unless除非；B. Since自從；C. as soon as一……就……；D. so that為了。根據(jù)句意及語境此題應選D。

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