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名词性从句People might have been more honest in the past when lif

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名词性从句
People might have been more honest in the past when life was very diffenent from__ it is today
A that what
B what
请为什么选择 B,不选择A.
请详细分析
名词性从句People might have been more honest in the past when lif
这是what引导的名词性从句 作 介词宾语 是宾语从句
what是 从句中的表语
如果选 that 则从句中 缺表语 that引导名词性从句 时 that不能充当句子成分
如果选 that what则 从句中 缺谓语 也就是 that是连词 引导宾语从句.what引导的从句是宾语从句中的主语 从句缺谓语 故错