Question

______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

Answer 1

C

试题分析：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。