填空题 He had focused upon one contemporary 1of a fundamental problem, the roots of which are as deep as American history itself.(manifest)
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【正确答案】 1、正确答案：manifestation    
【答案解析】解析：句意：他曾对一个重要问题的当今表现进行关注，该问题的种种根源如美国历史般悠久。由one contemporary可知空格处缺一单数名词，故manifest的名词单数形式manifestation为答案。