Hi, Which of the following sentence is correct It was concluded that the fuel ratio of the engine is the most siginificant factor which influences the efficiency of the car or It has thus been concluded that the fuel ratio of the engine is the most siginificant factor which influences the efficiency of the car ' 'Thus' adds an extra meaning to #2 that is not present in #1, unless you want to say 'It was thus concluded . ' Both of these tenses are correct, but with different meanings. Consider two simpler examples.
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