Question : Directions: In the following question, out of the four alternatives, select the alternative that will improve the bracketed part of the sentence. In case no improvement is needed, select "No Improvement".
None knows how it (was happened).
(1) was happened
(2) has happened
(3) happened
(4) No Improvement
Option 1: 1
Option 2: 2
Option 3: 3
Option 4: 4
Correct Answer: 3
Solution : The correct answer is the third option because it correctly conveys the action in the simple past tense so the past form of the verb i.e., happened should be used .
So, the correct sentence should be: "None knows how it happened. "
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