请完成以下高中英语语法填空题
问题描述：
请完成以下高中英语语法填空题
for a clearer picture of ( )the student knows,most teachers use another kind of examination in additon to objective test.
我自己考虑的答案有两个,一个是which 一个是what,请高手给出正确答案并指明原因!
答
肯定添what 因为of是介词后面要有一个宾语,另外the students knows 后面要有一个宾语,所以添what 因为what=the thing that 相当于两个词