To be admitted to a key university .A. our parents always impress on us the importance of

问题补充：

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

答案：

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。