题目
题型:江苏专项题难度:来源:
---Perhaps it is the biggest challenge to Einstein’s Theory of Relativity. No one _____ any crack in his
theory for more than a century.
B. found
C. had found
D. would find
答案
核心考点
试题【---European scientists announced that the speed of light isn’t the speed limit. 】;主要考察你对过去完成时等知识点的理解。[详细]
举一反三
B.got in love
C.had been in love
D.fell in love
B.got in love
C.had been in love
D.fell in love
B.emptied
C.had emptied
D.empty
— No. I ________ too busy to have enough practice, so I didn"t take the driving test last week.
B. am
C. have been
D. had been
B. were starting
C. have started
D. had started
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