—Can you come and give us a talk on Thursday or Friday?—I am afraid day is possible. I am

问题补充：

—Can you come and give us a talk on Thursday or Friday?

—I am afraid day is possible. I am very busy these days.

A. either

B. neither

C. every

D. any

答案：

A. either

(答案→)B. neither

C. every

D. any

解析：根据语境可知这两天都不可以，故选neither，表示两者都不。