All possible means of controlling terrorism _ tried to check it.
Correct answer: A. Have been
- A. Have been
- B. Was
- C. Is
- D. Has been
Explanation
The subject of the sentence is "All possible means", which is a plural noun phrase.- The verb "have been" agrees with the plural subject and indicates that various means have been tried in the past.- The phrase "tried to check it" indicates that all possible means were attempted to control terrorism.
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