I would rather you did some reading while you are free, but you A. don’tB. didn’tC. would

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(答案→)A. don’t
B. didn’t
C. wouldn’t
D. weren’t
解析：would rather sb did something “宁愿某人（现在）做某事”所以此空针对现在情况叙述用助动词don’t。选A。