2. 外语
  3. After years of research, scientists have ______ the virus that is responsible for the disease.

After years of research, scientists have ______ the virus that is responsible for the disease.

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问题 After years of research, scientists have ______ the virus that is responsible for the disease.
选项 A、recognized
B、identified
C、guaranteed
D、notified
答案B
解析 语义连贯题。[A]“认出，承认”；[B]“确定，识别”，强调经过了一个过程才确定；[C]“保证，担保”；[D]“通知，宣告”。题干中的years of research(数年研究)提示科学家最终得到了结果，虽然这个过程漫长，但最终还是确定了这种病毒，[B]符合题意，是答案。
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大学英语六级

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