题目内容

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．devoting C．to devoteD．and devote
B
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。
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