We do not know whether they will

We do not know whether they will revert to（ ）about commission when they have gone over our quotation sheet.
A、being talked
B、talked
C、talk
D、talking
【正确答案】：D
【题目解析】：我们不知道他们看了我们的报价单后是否会重新讨论佣金问题。revert to doing sth.重新干某事