_______ that the scientist will give us a talk next month?
B
it在句中作形式主语，that引导的从句是真正的主语。本句运用的是疑问句式。
This offer is ____ your reply reaching us before May 5th.
The French maintain a ________ separation of personal and professional life.
_______ in thought, he almost ran into the car in front of him.
I ’ve got the order from the boss that the work _______ finished before 5 p.m. today.
We are looking forward to ___ your L/C for Order No 123.( )