I to the lecture that afternoon, but I a bit ill.
A. should have gone; was
B. would have gone; had been
C. should go; was
D. would go; had been
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(答案→)A. should have gone; was
B. would have gone; had been
C. should go; was
D. would go; had been
解析：考查虚拟语气。根据时间状语that afternoon可知是对过去的情况比赛虚拟，使用情态动词+have done,排除CD。Should have done本应该做某事，实际上却未坐；would have done会做某事。But后面的句子应该使用陈述语序，根据前句的that night可知后半句使用过去时。故A正确。