one of which is whether the test had a negative impact on children 这个句子的错误 如何改

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one of which is whether the test had a negative impact on children 这个句子的错误 如何改
one of which is whether the test had a negative impact on children 这个句子的错误 如何改

one of which is whether the test had a negative impact on children 这个句子的错误 如何改
had 改has ,保持时态一致.