帮忙解释为什么选哪个选项_______ the polluted air is dangerous for our health.A.Exposing B.Exposed C.Being exposed D To expose
问题描述：
帮忙解释为什么选哪个选项
_______ the polluted air is dangerous for our health.
A.Exposing B.Exposed
C.Being exposed D To expose
答
选c
“使...暴露于...（环境）之中，使...和...接触”，常用被动语态：be exposed to sth
如：Being exposed to sunsunshine for too much time will do harm to one's skin.
长时间日晒会对皮肤对不利。
答
选D ,To expose 使处于……作用下
答
动词不定时作主语，改为这样应该好理解一点：it is dangerous for our health to expose the polluted air 。此句为it作形式主语，题中只是把主语还原了
答
D 不定式做主语
答
C.表被动