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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．a(chǎn)nd devote
B
后半句是一個(gè)伴隨狀語(yǔ)，現(xiàn)在分詞作伴隨狀語(yǔ)表示主動(dòng)關(guān)系，過去分詞則表示被動(dòng)關(guān)系，這里Principal White與devote 是主動(dòng)關(guān)系。
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