Being exposed to the sun for too long is bad for our skin.主语问题为什么主语要用being done的形式却不能省略be?什么成分可以省略be?什么时候不能省略?

be exposed to中的exposed是adj还是过去分词______to the sun does harm to our skin.空中应该填being exposed还是exposed exposed to the elements be exposed to the situation being exposed to the sunlight too long will do harm to one's skin.为什么开头不能用exposed 区别在哪 _to the English-speaking environment helps..______to the English——speaking environment helps to improve your English much faster.A.Being exposed B.exposed 为什么选A.. 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 _____ to sunlight for too much time will do harm to one's skin.A.Exposed B.Having exposed C.Being exposed D.After being exposed ___to sunlight for too much time will do harm to one 's skin.A Exposed B having exposed C.being exposed D after being exposed Being exposed to sunlight for too much time will do harm to one's skinA.Exposed B.Having exposed C.Being exposed D.After being exposed 为什么ABD不行 4.________ to sunlight for too much time will do harm to one's skin.A.Exposed B.Having exposed C.Being exposed D.After being exposed 1.________ in the queue for half an hour,Tom suddenly realized that he had left his wallet at home.A.To wait B.Have w The kids lay face down on the beach,their backs________ to the sun.A.exposing B.exposed C.having exposed D.were exposing我搞不清楚了，这是独立主格吗？那选择B是being exposed省略了being,还是就是过去分词exposed啊？过去 To my knowledge,_to sunlight in Hainan Will Surely Burn Your Skin.A.after having been exposed B.being exposed.C.exposed D.having exposed 特别是C, expose the skin to sunlight /the skin is exposed to sunlight (being exposed )to sunlight too much will do harm to one's skin为什么这个句子里做主语的动名词要用被动形式?exposing 不可以吗? being exposed to sunlight for a long time is harmful to ones skin这是为什么用being exposed 不能用exposed _____ to sunlight for too much time will do harm to one's skin.Exposed Having exposed Being exposed After being exposedWith the rapid development of this mountainous area,the number of the visitors is expected to double ____of the present within 3 ye 1、( ) to sunlight for too much time will do harm to one's skin.A Exposed B Being exposedC Having exposed D After being exposed 2、A middle-aged woman came ( )to the bus stop only( ) the bus had gone.A run;to find B running;to find C and ran;found ____to sunlight for too much time will do harm to one's skin.A.expose B.having exposed C.being exposed D.after being exposed ___ to the strong sunlight for a long time will do great harm to your skin.A.Exposed B.Being exposed 用现在分词或过去分词时,不是说主语和be动词一起省略嘛.