Cornwall Research Facility in Salem primarily focuses on lung cancer research______treatment.

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问题 Cornwall Research Facility in Salem primarily focuses on lung cancer research______treatment.

选项 A、so
B、nor
C、but
D、and

答案D

解析根据上下文可知在横线上应该填入一个可以连接research和treatment的连词。查看四个选项可知选项(D)的and作为并列关系的连词是正确的答案。

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