问题补充：
She must be looking forward to 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：考查省略句：seeing 句子有省略she must be looking forward as much to his return as he himself is （looking forward ）to her。Look forward to doing sth…，因为跟前面重复，所以省略，句意：她一定很期望他的回归。正如他自己也很想看到她一样。
