No matter what you have achieved, you have no reasons to _____others in your fieldA.look onB.look up toC.look forward toD.look down upon
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D解析考查短语辨析。look on 旁观，look up to 不辜负，look forward to 期望，look down upon 轻视，看不起，句意：不管你实现了什么，你都没有理由看不起和你在一个领域的其他人。所以选D。