Question

________is the best student in your class？

1. A.
   Whom do you think
2. B.
   Do you think who
3. C.
   Do you think whom
4. D.
   Who do you think

Answer 1

D
解析：

分析：含有do you think的宾语从句时要把宾语从句的引出词放在句首，跟下来是do you think，再把宾语从句继续下去。