After describing the planned improvements， she went on how much they would cost.
A. to explain
B. explaining
C. to be explaining
D. having explained
网友回答
(答案→)A. to explain
B. explaining
C. to be explaining
D. having explained
解析：go on to do sth 与 go on doing 之间有区别：前者表示做完某事后接着或继续做另一事，后者表示继续做同样的事。如：He went on to show us how to do it. 他接着又教我们如何做。Mother went on cooking； I went on with my homework. 妈妈继续做饭，我继续做功课。