I here earlier, but I couldn’t catch the first bus.A. should comeB. have come C. should b

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A. should e
B. have e
C. should be
(答案→)D. should have e
解析：考查虚拟语气。根据but后句可知前句是表示与过去相反的虚拟语气。故D正确。句意：我本应该早点就到这里的。但是我没有赶上头班车。