Heroes are those who，given a choice between doing the right thing at great personal cost or the wrong thing for great personal benefit，＿＿＿＿the former.
A. choose
B. chosen
C. choosing
D. to choose
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(答案→)A. choose
B. chosen
C. choosing
D. to choose
解析：句中given a choice between doing the right thing at great personal cost or the wrong thing for great personal benefit，是插入语，做题时暂且不考虑。这样句子就变成Heroes are those who＿＿＿＿the former. 空中需要填谓语成分，而四个选项中只有A能作谓语，故选A。句意：所谓英雄，假如给其一个机会在下列两者中选其一：不惜个人的最大的代价也要去做正确的事情和为了个人最大的利益不惜去做错误的事情，他会选前者。