Please don’t phone him between 1 and 3 p.m. tomorrow. He a lecture then.
A. will have delivered
B. has been delivering
C. will be delivering
D. delivers
网友回答
A. will have delivered
B. has been delivering
(答案→)C. will be delivering
D. delivers
解析：句意：请不要在明天下午一点到三点之间给他打电话，那时他正在做演讲。下文中的“then”指上句中的明天的下午一点到三点这一段时间持续做的事情，表将来。“做演讲”就在这段时间里发生，所以用将来进行时。