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It’s very dangerous to _______ these viruses without any protection.

A.be exposed toB.expose toC.exposeD.be exposing to

A

解析试题分析:句意:在没有任何保护措施的情况下,暴露于病毒下是非常危险的。是“被暴露”,故用被动语态,选A。
考点:考查语态

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