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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About Bioenergetics
Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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