Unknown to some people, an open university is the place _______ students at different ages can be admitted.

A. in where                     B. into which       C. which D. that

（2010·湖南醴陵二中高三上第二次月考）24. Unknown to some people, an open university is the place _______ students at different ages can be admitted.

A. in where    B. into which  C. which D. that