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After ________in the research for so many years，the scientist succeeded in finding the result at last.
A．buriedB．being buriedC．having buriedD．having been buried
D

試題分析：考查動名詞用法。動名詞的通常放在介詞后后面。當動名詞的動作發(fā)生在謂語動詞之前的時候，使用完成式。驚訝：在致力于研究工作很多年以后，這位科學家終于成功找到了一個解決的方法。根據句意說明多年的研究工作是在找到答案之前就發(fā)生的。故使用完成時。而本句是一個固定詞組be buried in…致力于…
點評：動名詞的通常放在介詞后后面。當動名詞的動作發(fā)生在謂語動詞之前的時候，使用完成式。同時也要注意動名詞的復合結構。
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