After the typhoon Long Wang,the local government did everything it could______the paple in the stricken areas.A helping out B help out C helped out D to help out不明白为什么选D,could不是情态动词吗?难道还有什么隐含的知识点?

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After the typhoon Long Wang,the local government did everything it could______the paple in the stricken areas.A helping out B help out C helped out D to help out不明白为什么选D,could不是情态动词吗?难道还有什么隐含的知识点?
After the typhoon Long Wang,the local government did everything
it could______the paple in the stricken areas.
A helping out B help out C helped out D to help out
不明白为什么选D,could不是情态动词吗?难道还有什么隐含的知识点?

After the typhoon Long Wang,the local government did everything it could______the paple in the stricken areas.A helping out B help out C helped out D to help out不明白为什么选D,could不是情态动词吗?难道还有什么隐含的知识点?
D选项中的to表示做这件事的目的.
它并不是与could的固定搭配.
句中的could实际上是can的原型,因为前面用到did,表明是过去时态,所以can亚要用过去时态.
句子可以译为:台风Long Wang过后,当地政府尽最大努力帮助受灾地区百姓,如何如何.
举一个例子,I will do every thing I can to help you pass the exam.
这句话实际上说到I will do every thing I can ,结构上已经完整了.
后面的to help you pass the exam.就是表示目的,做补充说明.

很明显是D。你仔细看一下句子,是一个to引导的目的状语从句“the local government did everythingit could ”来"help outthe paple in the stricken areas"

其实这句子的原句是这样的
.After the typhoon Long Wang,the local government did everything
it could "do" to help out the paple in the stricken areas.
它只是省略了do 而已.

句子结构啦,it could是修饰local gov的,help out帮助。。。脱离困境。
句子结构是: the local ... do ... to help out the people.

it could 是用来修饰前面的everything,是补语从句
主句是the local government did everything to help out the paple