-----What did you do with the order?I handed it to I think is in charge of sales.A

问题补充：

-----What did you do with the order?

----- I handed it to I think is in charge of sales.

A. whoever

B. whomever

C. who

D. whom

答案：

A. whoever

B. whomever

C. who

D. whom

解析：考察宾语从句。介词to后面接宾语从句。宾语从句Whoever I think is in charge of sales 中的I think是插入语。Whoever在句中作主语。