—I’m going to attend your lecture at 9∶30 tomorrow morning.—I regret to tell you that. Whe

问题补充：

—I’m going to attend your lecture at 9∶30 tomorrow morning.

—I regret to tell you that. When you arrive, it will have ended and I questions with my students.

A. would discuss

B. will discuss

C. will be discussing

D. am discussing

答案：

A. would discuss

B. will discuss

(答案→)C. will be discussing

D. am discussing

解析：根据题意“当你明天到得时候，演讲将会已经结束，我将正在和学生讨论问题。”可知此题应用将来进行时。