He was faced with the of whether or not to return to his country after he got the doctor's degree in America．A.situationB.circumstanceC.environmentD.dilemma
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D解析试题分析：考查名词：A． situation形势B． circumstance 环境C． environment环境D． dilemma窘境，两难境界，句意：他面临在美国获得博士学位后是否回国的两难境界。选D。
考点：考查名词辨析
点评：名词的词义辨析主要放在上下文的语境中进行，要注意名词的固定搭配和上下文串联。