Everybody knows that coal_________-- electricity for agriculture and industryA is used to produceB used to produceC is used to producingD used for producing

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Everybody knows that coal_________-- electricity for agriculture and industryA is used to produceB used to produceC is used to producingD used for producing
Everybody knows that coal_________-- electricity for agriculture and industry
A is used to produce
B used to produce
C is used to producing
D used for producing

Everybody knows that coal_________-- electricity for agriculture and industryA is used to produceB used to produceC is used to producingD used for producing
A
be used to do 什么被用来干什么
be used to doing 习惯于干什么
used to be 过去常常干什么
be used for 什么被使用为了什么

A
大家都知道煤炭用来为工农业发电

a
be used to do/ for doing sth 被用来做...
used to do 表示曾经怎样做

C,在这里,be used to 是动词部分,后面应该接动名词。

A
宾语从句嘛,当然要有谓语,排除BD
sb be used/ju:st/ to doing 是 某人习惯于干某事,这个是与would相区别的,would是指过去的习惯,现在没有了.
sth be used/ju:zd/ to do 是 某物被用于干某事
这里的意思是众所周知煤用于为工农业提供电能,因此表用途
另外还个常用的是sb used/ju:st/...

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A
宾语从句嘛,当然要有谓语,排除BD
sb be used/ju:st/ to doing 是 某人习惯于干某事,这个是与would相区别的,would是指过去的习惯,现在没有了.
sth be used/ju:zd/ to do 是 某物被用于干某事
这里的意思是众所周知煤用于为工农业提供电能,因此表用途
另外还个常用的是sb used/ju:st/to do sth译为某人过去常常做某事

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A