We look forward to ( )to the opening ceremony

问题描述:

We look forward to ( )to the opening ceremony
invite B be invite C having been invited D being invited

D being invited是动名词inviting的被动式
to是介词,后面要跟动名词短语作其宾语,排除A、B;而C是动名词的完成时,表明该动作先发于look forward to的动作,故错误.