.Charcoal was ______ used in blast furnaces(高炉).

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.Charcoal was ______ used in blast furnaces(高炉).
A.the chief fuel B.the chief fuel that
我的问题是为什么不用that啊.不要说是凭语感.要从语法的角度透彻的讲讲吧.最好也讲讲到底什么时候能用that.什么时候不能用.或者可以省略.

选A ,后面的used 是过去分词做定语,用b 的话就变成了定语从句,但是that 后面还要加一个was 和used 构成被动语态,也就是：
...Charcoal was the chief fuel that was used in blast furnaces.

.Charcoal was ______ used in blast furnaces(高炉). The water (was) filtered through charcoal.WAS要不要加 He is not the man like he ______. A.used B.was used to C.use 英语翻译This could be a photo of from above showing furnaces in it_____here,on this card,that it was used in plays In which country was the saying first used?翻译 It was in that house____he used to live_____the secret meeti Computers are ________(wide) used in the world.______(travel I’m used to ______ early in winter morning. bamboo is used ______ dishes in some places. I’m used to ______ early in winter morning She lived in the house ______ she used to live.