(2013·山西四校二模)Studies show that students often to too much pressure tend to develop mental

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A. exposing
B. being exposed
C. to expose
(答案→)D. exposed
解析：选D　考查非谓语动词。此处为非谓语动词作后置定语，因expose与students之间构成逻辑上的动宾关系，故应用被动形式，排除A、C两项，此处不表示正在进行的动作，排除B项，故选D，为过去分词作后置定语。