他没通过考试在一定程度上是由于他粗心。
当他没通过考试的时候，他意识到他原本应在功课上花更多时间。
When he failed the exam, he realized that he should have spent have more time on his lessons.
当他没通过考试的时候，他意识到他原本应在功课上花更多时间。
When he failed the exam, he realized that he should have spent have more time on his lessons.
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