With the help of high technology, more and more new substances _____ in the past

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
题型:陕西省高考真题难度:| 查看答案
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
题型:上海高考真题难度:| 查看答案
More patients _____ in hospital this year than last year.
A. treated
B. have treated
C. had been treated
D. have been treated
题型:江苏高考真题难度:| 查看答案
— 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
题型:高考真题难度:| 查看答案
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
题型:专项题难度:| 查看答案
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