—What’s worrying you dear?—Nothing. I was just thinking about the problem tomorrow.A. to

问题补充：

—What’s worrying you, dear?

—Nothing. I was just thinking about the problem tomorrow.

A. to be discussed

B. being discussed

C. discussed

D. discussing

答案：

(答案→)A. to be discussed

B. being discussed

C. discussed

D. discussing

解析：

这里考查非谓语动词做定语的用法，不定式的被动to be done表示“将要被…的”，being done表示“正在被…的”，过去分词做定语就表示一般情况的被动。因为时间是tomorrow，所以选A。句意是：我在考虑明天将被讨论的问题。