问题补充：
--Is it convenient to you if I pay a visit to you at 10:00 tomorrow morning?
--I m afraid not. I a lecture then.
A. will have given
B. am about to give
C. will be giving
D. was giving
答案：
A. will have given
B. am about to give
(答案→)C. will be giving
D. was giving
解析：可联系答.案.网客服索取。
