By accident, he he had done something wrong and that he hadn’t been prison for a few weeks

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(答案→)A. let out
B. made out
C. made sure
D. took care
解析： let out泄露，透露；发出（叫声），此题根据句意应为“无意中透露出……”，故答案选A。take care后不能接宾语从句；而make sure 与accidentally矛盾。take care当心；make sure 有把握，一定；make out弄清楚；理解，明白。