the bones under the sand，the scientists concluded that they came from the dinosaurs about 65 million years ago．
A. Being inspected
B. Inspected
C. Having inspected
D. To inspect
网友回答
A. Being inspected
B. Inspected
(答案→)C. Having inspected
D. To inspect
解析：考查非谓语动词。本题的逻辑主语为the scientists，与inspect之间为主动关系，再根据其动作有先后性，故用having done结构。句意：检查过沙下面的骨头之后，科学家断定它们是来自大约6千5百万年前的恐龙。故C正确。