--- Is it convenient to you if I call you up at 9 o’clock tomorrow morning?
--- I’m afraid not. I a speech then.
A. was giving
B. will be giving
C. am giving
D. will have given
网友回答
A. was giving
(答案→)B. will be giving
C. am giving
D. will have given
解析：考查时态。根据语境时间状语at 9 o’clock tomorrow morning，故用将来进行时，选B。