She must be looking forward as much to his return as he himself is to her.A. seeB. have

问题补充：

She must be looking forward as much to his return as he himself is to her.

A. see

B. have seen

C. seeing

D. be seeing

答案：

A. see

B. have seen

(答案→)C. seeing

D. be seeing

解析：本句实际上考察的是固定搭配look forward to…期待..；其中的to是介词，后面要接名词或者动名词做宾语。句中的as much as表示程度上是一样的。句义：她一定在期待这他的归来，就正如他期待她一样。故C正确。