英语句首什么时候用不定式什么时候用进行时_____by a greater demand for vegetable,farmers have built more green houses.A driven B being driven C to drive D having driven____how to make the products,they went to ask the engineer for h

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英语句首什么时候用不定式什么时候用进行时_____by a greater demand for vegetable,farmers have built more green houses.A driven B being driven C to drive D having driven____how to make the products,they went to ask the engineer for h

英语句首什么时候用不定式什么时候用进行时_____by a greater demand for vegetable,farmers have built more green houses.A driven B being driven C to drive D having driven____how to make the products,they went to ask the engineer for h
英语句首什么时候用不定式什么时候用进行时
_____by a greater demand for vegetable,farmers have built more green houses.
A driven B being driven C to drive D having driven
____how to make the products,they went to ask the engineer for help.
A knowing B not knowing C having not knowing D having know
____,liquid can be changed into gas.
A heated B to be heated C heat D heating

英语句首什么时候用不定式什么时候用进行时_____by a greater demand for vegetable,farmers have built more green houses.A driven B being driven C to drive D having driven____how to make the products,they went to ask the engineer for h
这三道题都是非谓语动词做状语,分别表示原因（1,2）时间（3）分词做状语才能表示时间,原因,条件,而不定式表目的,分词作状语时,分词的逻辑主语就是句子的主语,故1 被动选A.2主动且状态否定选B,3被动选A

表主动用进行时 表目的用不定式
第一题 FARMERS 是主动 所以排A C 后面是现在完成时 所以前面的空也要用完成时 因为前面的动作在后面之前 所以选D
2。 跟上1题茶不多 因为THEY``是主动KNOW 所以选C

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