题目内容

It’s very dangerous to _______ these viruses without any protection.
A．be exposed toB．expose toC．exposeD．be exposing to
A

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。
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