In a 2004 ________ of college students, it was found that 60 percent of students work during their s

In a 2004 ________ of college students, it was found that 60 percent of students work during their spare time.

A.view

B.inspection

C.observation

D.survey

答案及解析： D

解析：

题意：“在一个2004年的调查中发现……”，survey调查。