When by the teachers, a student tends to study harder than usual.A. to be praised B. prai

When by the teachers, a student tends to study harder than usual.
A. to be praised
B. praising
C. praised
D. to praise

A. to be praised B. praising (答案→)C. praised D. to praise解析：试题分析：考查状语从句的省略。主句的主语是 a student ，结合by the teachers可以得知， a student与praise构成被动关系，故排除ＢＤ，根据句意，“被老师表扬”发生在＂比以前更努力学习＂之前，故用过去分词，表被动，完成。故选Ｃ

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