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The scientist knew nothing about the matter, because he was always _________ himself in his study.
A.burying B.devotingC.focusingD.concentrating
A

试题分析:考查动词和动词搭配:A. burying 埋葬,bury oneself in…B. devoting奉献,致力于,devote oneslf to …,C. focusing专注,focus…on,D. concentrating专注,concentrate on,句意:科学家不了解这个事情,因为他总是埋头在书房里面。选A。
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