2. 专升本
  3. At about the same time, doctors began to understand______together.

At about the same time, doctors began to understand______together.

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问题 At about the same time, doctors began to understand______together.
选项 A、which went dirt and disease
B、what went dirt and disease
C、that dirt and disease went
D、that did dirt and disease go
答案C
解析
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