单选题After describing the plan

问题补充：

单选题Afterdescribingtheplannedimprovements，shewenton_____howmuchtheywouldcost.A.to explainB.explainingC.to be explainingD.having explained

答案：

A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。