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【题目】—European scientists announced that the speed of light isn’t the speed limit.

—Perhaps it is the biggest challenge to Einstein’s Theory of Relativity. No one ________ any crack in his theory for more than a century.

A. has found B. found C. had found D. would find

【答案】C

【解析】考查动词时态句意:——欧洲科学家宣布光速不是速度极限。——也许这是对爱因斯坦相对论最大的挑战,一个多世纪以来没有人发现他理论中的漏洞上句中的announced发生在过去,“一个多世纪以来没有人发现”是发生在announced之前,是“过去的过去”,用过去完成时,故选C。

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