With a relative pronoun or a relative adverb:<br>Among all the reasons, lack of interest was the most important one____

With a relative pronoun or a relative adverb:
Among all the reasons, lack of interest was the most important one_____ I failed the exam.

With a relative pronoun or a relative adverb:
Among all the reasons, lack of interest was the most important one_____ I failed the exam.
【正确答案】：why

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