The onset off the Second World War (A)/ showed that the League (B)/ has failed its primary purpose,(C)/ which was prevent (D)/ any future world war (E).
The onset of the Second World War showed that the League had failed its primary purpose, which was to prevent any future world war . A- ‘Off’ is an adverb which is inappropriate here and should be replaced with the preposition ‘of’. C - talking about the past, the verb should be in its past form and thus ‘had’ will be used. D - the preposition ‘to’ will be placed to make the sentence meaningful.
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