Carelessness isn't the main reason( )you didn't do well in the exam.

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Carelessnessisn''tthemainreason()youdidn''tdowellintheexam.Carelessnessisn''tthemainreason()youdidn''tdo

Carelessness isn't the main reason( )you didn't do well in the exam.
Carelessness isn't the main reason( )you didn't do well in the exam.

Carelessness isn't the main reason( )you didn't do well in the exam.
you didn't do well in the exam,是一个完整的句子,不缺任何句子成分,所以,要添加一个副词,根据题意就只能填why

why

why