Years later he returned home unexpectedly the old tree of his childhood.A. findingB. to

问题补充：

Years later, he returned home, unexpectedly the old tree of his childhood.

A. finding

B. to be found

C. found

D. having found

答案：

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。