---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 histheory for more than a century.

试卷相关题目

• 1---- I called you 10:30 p.m, but you didn't answer it.  ----I _____my work and ______a bath.

  A.was doing; had taken

  B.had done; had taken

  C.was doing; was taken

  D.had done; was taking

  开始考试点击查看答案
• 2It was the first time that Tim ______ a lie. He was scared.

  A.told

  B.was telling

  C.would tell

  D.had told

  开始考试点击查看答案
• 3I was just going to move away the heavy case but someone ________ it. Was it you?

  A.has done

  B.would do

  C.had done

  D.will do

  开始考试点击查看答案
• 4We wouldn't have called a taxi yesterday if Harold ______ us a ride home.

  A.didn't offer

  B.wouldn't offer

  C.hasn't offered

  D.hadn't offered

  开始考试点击查看答案
• 5The manager is said to have arrived back from Paris where he ________ some European business partners.

  A.would meet

  B.is meeting

  C.meets

  D.had met

  开始考试点击查看答案
• 6-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

  开始考试点击查看答案
• 7When I got there, the meeting _____ for ten minutes.  

  A.has been on

  B.had begun

  C.had been on

  D.has begun

  开始考试点击查看答案
• 8— What a pity!— Yes, I ____ his not trying it, but in vain.

  A.was suggesting

  B.will suggest

  C.would suggest

  D.had suggested

  开始考试点击查看答案
• 9— Isn't it a surprise that I happened to meet Emily at Doris' birthday party last weekend?— If my memory serves me correctly, you _________ each other for exactly three years. 

  A.hadn't seen

  B.haven't seen

  C.didn't see

  D.don't see

  开始考试点击查看答案
• 10By the time he graduated from university, he ______ more than two novels.

  A.has written

  B.had been writing

  C.will have written

  D.had written

  开始考试点击查看答案