问题
选择题
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
C
题目分析：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。
点评：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。