Principal White has been working in the school for about 20 years, ______all his energy to teaching and researching as well as the running of a healthy school．A.devotedB.devotingC.to devoteD.and devote
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B解析后半句是一个伴随状语，现在分词作伴随状语表示主动关系，过去分词则表示被动关系，这里Principal White与devote 是主动关系。