These days we have been looking forward to _____ to visit you.

问题描述:

These days we have been looking forward to _____ to visit you.
A coming B will come C came D have come

选A look forward to doing ,况且B\C\D都是作谓语,而题目中已经有谓语了不再需要谓语了所以就可以排除另外三个了.