Question : Select the most appropriate option to fill in the blank.
A study on vehicular pollution ______ revealed some startling facts.
Option 1: have
Option 2: has
Option 3: is
Option 4: are
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Correct Answer: has
Solution : The second option is the correct choice.
The sentence is in the present perfect tense, and it suggests that the study on vehicular pollution has already been conducted, resulting in the revelation of some startling facts.
Therefore, the correct form is "has revealed" , making "has" the appropriate option for the blank.
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