At about the same time,doctor began to understand _____ together.
问题描述：
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
答
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...