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

試題分析：考查動詞和動詞搭配：A. burying 埋葬，bury oneself in…B. devoting奉獻(xiàn)，致力于，devote oneslf to …，C. focusing專注，focus…on，D. concentrating專注，concentrate on，句意：科學(xué)家不了解這個事情，因?yàn)樗偸锹耦^在書房里面。選A。
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