All of her time _______ to carrying out a further study on the cause of Alzheimer's disease since she left school.

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1. (2018高一上·南昌月考) All of her time _______ to carrying out a further study on the cause of Alzheimer's disease since she left school.

A . has been devoted B . devoted C . has devoted D . was devoted

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上外版（2020）高中英语必修一Week 9 基础卷