Tests have confirmed that four people in Wisconsin contracted the monkeypox virus after coming into close contact with pet prair

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问题     Tests have confirmed that four people in Wisconsin contracted the monkeypox virus after coming into close contact with pet prairie dogs, marking the【C1】______time the disease has been【C2】______in the Western Hemisphere. Fourteen more people in Wisconsin are【C3】______of suffering【C4】______the virus. Thirteen of them were around prairie dogs; the other【C5】______contracted it after handling a sick rabbit【C6】______had been around a prairie dog. It doesn’t appear anyone contract the virus from another person.
    Monkeypox has caused an【C7】______of rashes, fevers and chills in people across the upper Midwest【C8】______early May. Monkeypox is a Virus infection that is【C9】______to smallpox. The virus has been found【C10】______in west African nations and had never before been seen in Western Hemisphere. The outbreak【C11】______from a【C12】______of prairie dogs that came from a【C13】______distributors in suburban Chicago. It was there【C14】______the prairie dog may【C15】______infected【C16】______monkeypox by a Gambian rat—a rodent indigenous to African countries. The human death rate in Africa has【C17】______from 1 to 10 percent, but the virus may be【C18】______lethal in the United States, because people are typically better【C19】______and medical technology is【C20】______more advanced."
【C8】

选项 A、since
B、before
C、after
D、in

答案A

解析 根据全句时态(完成时)判断,只有since符合结构。
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