_______ 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。
Mrs. Jones had a _____ husband, who would do anything for her.
We have received your letter of September 12, ______ we are glad to know that you are interested in our electric heaters.
We look forward to ______ the goods in the fourth quarter.
I ’ve got the order from the boss that the work _______ finished before 5 p.m. today.
China is a mountainous country.Hills,mountains,and plateaus cover _______ of the total area.