The scientist knows nothing about the matter, because he is always ______ himself in scientific stud...
2022-10-24 13:11:52 28次 2015-2016学年吉林长春市高一上学期第三次月考英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
The scientist knows nothing about the matter, because he is always ______ himself in scientific study.
A. burying B. devoting C. focusing D. concentrating
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