To be admitted to a key university, .
A. our parents always impress on us the importance of hard work
B. some universities attach great importance to students’ grades
C. all the students in senior 3 are making every effort to study hard
D. good grades are quite necessary
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A. our parents always impress on us the importance of hard work
B. some universities attach great importance to students’ grades
(答案→)C. all the students in senior 3 are making every effort to study hard
D. good grades are quite necessary
解析：考查不定式用法。当不定式在句中做状语的时候，不定式的逻辑主语就是句子的主语。本题的不定式to be admitted to a key university的逻辑主语是学生，故选项中只有C项的主语是学生，故C正确。