---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-高中英语-魔方格

◎ 题干

---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

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◎ 解析

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◎ 知识点

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