_______ 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。
lt is our sin cere hope that you will direct your efforts __ the promotion of this new product in your market __ our mutual ben efit.
He betrayed no _______ of discontent, except such as may follow evening?s drinking.
Please write a report ________ the above subjects are to be covered.
We have lodged a claim ______ the seller for the shortage of shipment ______ S.S. DONGFENG.