问题补充：
Could I speak to is in charge of International Sales please?
A. who
B. what
C. whoever
D. whatever
答案：
A. who
B. what
(答案→)C. whoever
D. whatever
解析：whoever既作了 to 的宾语，又作is in charge of International Sales please?的主语。“whoever”作代词，/any person who/the person who/“任何人”、“无论谁”、“……的人”。
