Zhaopin.com did a survey of _____ students spent on job hunt and found the expense varied from person to person.

A．how much          B．where        C．how many         D．why

（2010·江苏赣榆县城头高级中学高三第一次调研考试）    30. Zhaopin.com did a survey of _____ students spent on job hunt and found the expense varied from person to person.

A. how much      B. where         C. how many          D. why