2019年mpa考试英语真题——动词的时态273

{01}---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
解析：
本题选C。

{02}-Why are you unhappy today?
-The watch，which I ________  the other day，is out of order again.
A.   had repaired  
B.had repair  
C.had it repaired  
D.had repaired it
解析：
本题选A。

{03}When I got there, the meeting _____ for ten minutes.  
A.has been on      
B.had begun    
C.had been on    
D.has begun
解析：
本题选C。