题目

After a short holiday, he _____ himself once more to his studies. 　　A. applied    B. converted    C. engaged    D. exerted 答案：A　　 解析: apply oneself to“致力于”。Apply one's mind to(专心于)。Apply to sb. for aid(向某人求援)。Apply a theory to practice(把理论应用于实践)。

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