What do you think 【 】 a good singer?

问题描述:

What do you think 【 】 a good singer?
A.makes B.to makes C.made D.making
请写出答案并说明理由.
小女子在这里谢谢各位了.

A do you think 是插入语,可以去掉What makes a good singer .what作主语