This means that for the first time doctors may be able to tell if an infected（被感染的）person who feels well is _______ being ill, so that they can try to do something to prevent this.A.in case ofB.in danger ofC.in terms ofD.in charge of
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B解析考查短语辨析。in case of万一；in danger of处于危险之中；in terms of就…而言；in charge of负责 根据意思：医生可以判断一个感觉不错的被感染的人是否处在生病的危险之中。