, a learned man makes fewer mistakes in life than a man without knowledge.
A. In general
BAs general
COn general
D. At general
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(答案→)A. In general
B. As general
C. On general
D. At general
解析：考查介词短语，in general一般来说，句意：一般来说，一个有学识的人在人生中比没有知识的人犯错更少。选A。