2. 职称英语
  3. At first, little______that we were sitting on top of a fundamental discovery in

At first, little______that we were sitting on top of a fundamental discovery in

游客2023-11-20  39
问题 At first, little______that we were sitting on top of a fundamental discovery in AIDS research.
选项 A、we knew
B、we did know
C、did we know
D、do we know
答案 C
解析
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