My teacher encouraged me more confident. A. am B. isC. be D. to be

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A. am
B. is
C. be
(答案→)D. to be
解析：考察非谓语动词。句意：我的老师鼓励我更自信一点。不定式做宾语补足语表示具体的将要进行的动作，encourage sb to do sth 为鼓励某人做某事，故选D