【单选题】
To understand ______ wars continue to go on when nearly everyone wants to have peace, we must look into the nature of war.
A.why
B.whether
C.if
D.that
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根据网考网移动考试中心的统计,该试题:
62%的考友选择了A选项
28%的考友选择了B选项
2%的考友选择了C选项
8%的考友选择了D选项