---European scientists announced that the speed of light isn’t the speed limit.
题型:江苏专项题难度:来源:
---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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A. has found B. found C. had found D. would find
答案
C
举一反三
They ________ with each other for two years before they got married.
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A.had fallen in love B.got in love C.had been in love D.fell in love