It is very dangerous to ( ) these viruses without any protection

问题描述:

It is very dangerous to ( ) these viruses without any protection
A expose B be exposed C expose to D be exposed to
A为什么错D为什么对

be exposed to sth 被暴露给.(原形是 expose ...to sth)
如果用A,就是用的主动形式,似乎是对的(“暴露给...”),但是其实这是受汉语影响.英语中必须说“被暴露给.“
没有任何保护被暴露给病毒,非常危险.