_______his thoughts, the scientist didn’t notice what had happened before him.

A. Absorbed in B. Caught in

C. Used to D. Interested in

A.

【解析】

試題分析：句意：陷入了深思，這位科學(xué)家沒有注意到發(fā)生在他面前的事情。A. Absorbed in 陷入沉思 B. Caught in 被困��；被抓住 C. Used to習(xí)慣于；過去常常 D. Interested in感興趣。根據(jù)語境得知是陷入深思， 故選A.。

考點：考查動詞短語的用法。

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