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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托福（TOEFL）

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

托福（TOEFL）

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ChooseyouranswersfromtheboxandwritethelettersA-Hnexttoquestions26-30.SharonandLesterhavedifferent(26)

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