With the help of high technology, more and more new substances _____ in the past
题型：上海高考真题难度：来源：
| With the help of high technology, more and more new substances _____ in the past years. |
A. discovered
B. have discovered
C. had been discovered
D. have been discovered |
答案
举一反三
| Though we don"t know what is discussed, yet we can feel the topic _______. |
A. had changed
B. will change
C. was changed
D. has been changed |
| In recent years many football clubs _____ as business to make a profit. |
A. have run
B. have been run
C. had been run
D. will run |
| More patients _____ in hospital this year than last year. |
A. treated
B. have treated
C. had been treated
D. have been treated |
— The window is dirty.
— I know. It _____ for weeks. |
A. hasn"t cleaned
B. didn"t clean
C. wasn"t cleaned
D. hasn"t been cleaned |
| When and where to enjoy our summer vacation _____ yet. |
[ ] |
A. aren"t decided
B. isn"t being decided
C. hasn"t been decided
D. haven"t been decided |
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