In fact the old couple looked forward every week their grandson .A. to seeB. to seeingC.

问题补充：

In fact , the old couple looked forward every week their grandson .

A. to see

B. to seeing

C. see

D. seeing

答案：

A. to see

(答案→)B. to seeing

C. see

D. seeing

解析：考查固定词组。Look forward to sth/doing sth期待sth/做某事，其中的to是介词，后面可以使用动名词。