Studentsaresupposed________hardatschool.A.studyingB.studiedC.tostudyD.study

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C解析试题分析：考查短语be supposed to do sth 应该做某事，被期望做某事。句意：学生们应该在校努力学习。选C。考点：固定短语be supposed to

点评：be supposed to do sth 应该做某事，被期望做某事。本句式中to是不定式符号，不能接动名词或者名词，只能接动词原形。