This factory produces steel.中的steel为什么是不可数名词?

The factory has made more cars this year-there has been an increase in（ ）A .product B.produce C.production D.products为什么不选别的? The factory has made more cars this year—there has been an increase in _.A product B produce c.production Dproducts The factory has made more cars this year—there has been an increase in _.A product B produce c.production Dproducts produce This factory produces steel 中为什么produce 要加S 是因为第三人称单数吗如果主语是复数 那谓语动词要用什么形势 给我答题的 A big factory has been set up in this area ___ such goods for people all over the countrya.to produce b.producing c.produced d.being produced选B 为什么用V-ING形式呢? [-B28] A big factory has been set up in this area ___ such goods for people all over the country .A.to produce B.producing C.produced D..being produced翻译并分析 how long this factory (开办) A big factory has been built in this area _____ such goods for people…A big factory has been built in this area _____ such goods for people throughout the country.A.to produce B.producingC.producedD.being produced,我先告诉大家了,谁能帮我 Only that factory( )yesterday( )this kind of machines.A we visited;produces B did we visit;does itOnly that factory( )yesterday( )this kind of machines.A we visited;producesB did we visit;does it produceC we visited;does it produce D did we visited;p Only that factory( )yesterday( )this kind of machines.A we visited;produces B did we visit;doesOnly that factory( )yesterday( )this kind of machines.A we visited;producesB did we visit;does it produceC we visited;does it produce D did we visited;prod the factory is being____(large) to produce more products.顺便翻译, My uncle works in a factory that____toy cars(produce)最好能解释下为什么 this factory will produce ------ iron this year than it did last year.A 20 percent B more20 percent C 20 percent much more D much more 20 percentIt will take the authorities concerned----- time to carry out the investigation into the causes of the pl This is big factory.(改为复数) when___you____(begin)to work in this factory? show us( )this big factory AinBatCaroundDoff This factory produses___(steel)适当形式填空