Citing the fact that one oftheir more challenging hurdles has been the recent unexpected failure of the gene therapy treatment, the cancer therapy research team applied for additional government funding to further research the treatment.
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Atheir more challenging hurdles has been the recent
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Btheir more challenging hurdles has been the recently
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Cits more challenging hurdles is the recent
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Dits more challenging hurdles had been the recent
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Eits more challenging hurdles had been the recently
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正确答案: D