Question

— I will come to attend your lecture at 10:00 tomorrow.
— I’m sorry, by then my lecture will have ended and I＿＿my guests in my office.

A．is being met

B．will meet

C．will be meeting

D．will have met

Answer 1

C

by then 是指将来的时间状语，排除A。再由句意可知，meet指的是到了十点钟时将正在进行的动作。