---What can I do for you Sir?---It is not you waiters but is in charge of the restaurant

问题补充：

---What can I do for you, Sir?

---It is not you waiters but is in charge of the restaurant I want to talk to.

A. whoever; that

B. who; that

C. that; who

D. that; whom

答案：

(答案→)A. whoever; that

B. who; that

C. that; who

D. that; whom

解析：本题考查名词性从句及强调句。whoever无论谁在从句中作主语，后面填that为强调结构it is … that …结构，这里强调宾语。故选A。