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The ways ( ) air-conditioners work to "clean" the air can in

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The ways ( ) air-conditioners work to "clean" the air can inadvertently cause health problems,too.
A.which B.that C.in which D.in that
为什么答案是C而选B却不可以呢?
The ways ( ) air-conditioners work to
因为that只在单一个情形下使用的,这句子里"ways"是多於一个way,所以that不适用.
若果是一个way,即the way则要用 the way that.了.
因此你现在亦应明白,which 是有其中的一个选择的问句时使用的原因了.
The ways ( ) air-conditioners work to "clean" the air can in The air conditioners can cool the air.英语解释句子 Trees can help _____ the air in the city.A to clean B clean make the air clean lark in the clean air 的意思 Three trees can do the job of 15 air conditioners running al 英语翻译it is the technology related to air conditioners and CFC on the ground lay some air conditioners,which are to be ship All the air-conditioners are (of good quality). Putting a p—— in the room can make the air fresh and clean S We can get f___ air in the open air. you should open the window to let in the clean air.let in