He hated the war so much that he decided to leave the army _____.A.for longB.once in a whileC.for goodD.once upon a time
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C解析 for good (=permanently)永久地:He says he's leaving the country for good. for long 长久地。按本题题意，用 for long 不妥。once upon a time 从前。once in a while 偶尔。