---Have you finished doing the work?---Not.A. already;yetB. already;alreadyC. yet;yetD. ye

问题补充：

---Have you finished doing the work?

---Not.

A. already;yet

B. already;already

C. yet;yet

D. yet;already

答案：

A. already;yet

B. already;already

(答案→)C. yet;yet

D. yet;already

解析：already和yet都表示已经，不同是already只用于肯定句，yet用于否定句和疑问句当中。结合语境可知上文是一般疑问句，下文是否定句，故选C。