题目内容

---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.

提问人：韩莉发布时间：2020-01-17

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

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---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.

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