If someone has to an action or policy, they are responsible for it, and may be required to explain it to other people or be punished if it fails．
A. account for
B. make up
C. focus on
D. pay off
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(答案→)A. account for
B. make up
C. focus on
D. pay off
解析：考查词组：A． account for是什么的原因，解释B． make up弥补，编造C． focus on专注D． pay off还清，句意：如果有人不得不为行为或政策负责，他们要为他们负责，并被要求向别人解释如果没做到有可能被惩罚。选A。