Dr．Stephenhas_________himselfinrese

发布时间：2020-07-27 05:46:33

Dr．Stephen has _________ himself in researching the wild life in the recent five years．A.employedB.busiedC.devotedD.concentrated

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A解析句意：最近五年来，斯蒂芬博士潜心研究野生生命。employ oneself in doing使自己忙于……
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