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Istaredathim,realizingthathisanalysisandstrategywerecorrect.Ihadworkedmyhead,asIhadneverdonebefore.A.outB.overC.onD.off答案为D,我不理解啊?为什么选这个啊?什么意思啊?

题目详情
I stared at him, realizing that his analysis and strategy were correct. I had worked my head______,as Ihad never done before.
A.out B.over C .on D.off
答案为D, 我不理解啊?为什么选这个啊?什么意思啊?
▼优质解答
答案和解析
work one's head off 是苦干,不停工作的意思.
这里在说他的分析和战略很对,自己也要努力了.