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Updated on
30 Nov 2022

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Which one is more natural and correct and why?
1-The drug proved to be very effective
The drug proved to be very effective
2-The drug was proved to be very effective
3-The drug was proven to be very effective

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Which one is more natural and correct and why? 
1-The drug proved to be very effective 
The drug proved to be very effective
2-The drug was proved to be very effective 
3-The drug was proven to be very effective
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