He injured his leg and he could not play in the game.A. soB. howeverC. thereforeD. but

网友回答

A. so
B. however
(答案→)C. therefore
D. but
解析：考查副词：句意：他伤了腿，因此不能打比赛了。所以两句话是因果关系，B是副词“然而”意思不符合，A是“因此”但是so是连词，词性不对，D项but是“但是”，也是连词，C是“因此”而且是副词，选C。