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

試題分析：句意：在沒(méi)有任何保護(hù)措施的情況下，暴露于病毒下是非常危險(xiǎn)的。是“被暴露”，故用被動(dòng)語(yǔ)態(tài)，選A。
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