You have to leave now you can catch the early busA. so thatB. as soon asC. because D. if

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(答案→)A. so that
B. as soon as
C. because
D. if
解析：so that以便，所以；as soon as以……就……；because 因为；if如果。句意：你现在必须出发了，以便于你能赶上早班车。故选A。