Direction: In each of the following questions, a sentence/a part of the sentence is printed in bold. Four alternatives are given to the bold part which will improve the sentence. Choose the correct alternative as your answer. In case no improvement is needed, choose No improvement.
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None knows how it was happened.
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- was happen
- has happened
- happened
- No improvement
Correct Option: C
enough (Pro.) : as many or as much as somebody needs; sufficient.
It is not proper to use much enough here.
Hence, not enough is the right usage.
