At about the same time,doctor began to understand _____ together.what went dirt and diseasethat dirt and disease went 填哪个 为什么

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Ataboutthesametime,doctorbegantounderstand_____together.whatwentdirtanddiseasethatdirtanddiseasewent

At about the same time,doctor began to understand _____ together.what went dirt and diseasethat dirt and disease went 填哪个 为什么
At about the same time,doctor began to understand _____ together.
what went dirt and disease
that dirt and disease went
填哪个 为什么

At about the same time,doctor began to understand _____ together.what went dirt and diseasethat dirt and disease went 填哪个 为什么
At about the same time,doctor began to understand that dirt and disease went together.
几乎同时,医生开始意识到污物和疾病混在了一起.
that引导的宾语从句做understand的宾语.
what went dirt and disease本身语序就不对.