【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】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(yīng)選D。

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