We walked a long way to see him off, only that he had just left.
A. found
B. to find
C. finding
D. having found
网友回答
A. found
(答案→)B. to find
C. finding
D. having found
解析：考查不定式做状语。不定式做状语，表示意料之外的结果；现在分词做状语，表示意料之中的结果。句意：我们走了很远的路去为他送行，结果却发现你已经离开了。表示意料之外的结果。