2. 外语
  3. Medical research at the cellular level, ______research on the immune system, has been made possible through twentieth-century ad

Medical research at the cellular level, ______research on the immune system, has been made possible through twentieth-century ad

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问题 Medical research at the cellular level, ______research on the immune system, has been made possible through twentieth-century advances in techniques of genetic research.
选项 A、which
B、whereas
C、such as
D、is also
答案C
解析
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