The book has been translated into thirty languages since it _____ on the market
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| The book has been translated into thirty languages since it _____ on the market in 1973. |
A. had come
B. has come
C. came
D. comes |
答案
举一反三
| Bob would have helped us yesterday, but he _____. |
| [ ] |
A. was busy
B. is busy
C. had been busy
D. will be busy |
| Scientists have many theories about how the universe _____ into being. |
A. came
B. was coming
C. had come
D. would come |
| The Roman Empire _____ for several centuries. |
A. exists
B. existed
C. was existed
D. is existing |
| After the traffic accident, no one _____ except a few people who were badly injured. |
A. survive
B. survived
C. was survived
D. was surviving |
| Hidden _____ by a big tree, his house was not to be seen. |
A. as it was
B. as it is
C. as it did
D. as he did |
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