His lack of professional knowledge for the failure of the experiment. A. accountedB. expl

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(答案→)A. accounted
B. explained
C. counted
D. contributed
解析：考察固定搭配。本题中只有account可以和for连用形成account for占据…的比例；解释；其余三项都不能和for连用。句意：缺少专业知识可以解释他的实验的失败。故A正确。