—How did you deal with the order?—I handed it to I think is in charge of sales.A. who B.

问题补充：

—How did you deal with the order?

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

A. who

B. when

C. whoever

D. whomever

答案：

A. who

B. when

C. whoever

D. whomever

解析：C

解析句中有介词to，可知空格处引导宾语从句。空格后的I think可看作插入语，句子缺少主语，用whoever，表示“任何……的人”。who没有这种意思；whomever在句中作宾语。