核心问题
（1）They appointed him chairman.
(2) They appointed him as chairman.
(3) They appointed him to be chairman.
请问上面三种用法哪种是正确的？
词典解答
上面三种用法都是正确的。请看下面的实例：
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She appointed him secretary. (CGEL) 她任命他为秘书。
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He appointed Wilfrid as his deputy in the city of York. (Scheurweghs) 他任命威尔福利德为约克市的代理人。
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They appointed him to be chairman. (LDCE) 他们任命他为主席。