Years later, he returned home, unexpectedly the old tree of his childhood .
A. finding
B. to be found
C. found
D. having found
网友回答
A. finding
B. to be found
(答案→)C. found
D. having found
解析：考查独立主格结构：句意：多年后，他回到家，出乎意料的他童年的古树被发现了。逗号前面是简单句，中间没有连词，说明逗号后面是状语，用独立主格结构，由逻辑主语the old tree+非谓语构成，因为the old tree和find是被动关系，用过去分词，选C。