He decided to devote all his time and effort______scientific investigation.

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问题 He decided to devote all his time and effort______scientific investigation.

选项 A、in
B、on
C、from
D、to

答案D

解析 devote one’s time/life/energy…to(doing)sth.为固定搭配,意为“把某人的时间/生命/精力……奉献给(做)某事,致力于”。故选D。
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