do all/every thing (that) sd can(do)与do what sb can(do)的疑问这两句是省略句,后面跟不定式表目的。如We must do everthing we can_pollution_happy.A.to prevent ; to live B,prevent;to live .....应选A。而:I spend as much tim

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do all/every thing (that) sd can(do)与do what sb can(do)的疑问这两句是省略句,后面跟不定式表目的。如We must do everthing we can_pollution_happy.A.to prevent ; to live B,prevent;to live .....应选A。而:I spend as much tim
do all/every thing (that) sd can(do)与do what sb can(do)的疑问
这两句是省略句,后面跟不定式表目的。
如We must do everthing we can_pollution_happy.A.to prevent ; to live B,prevent;to live .....应选A。
而:I spend as much time as i can_both in and out of class.的缺空中为什么填的是practising,而不是to practise?
这两句都是省略句么?不是都是不定式做目的状语么?怎么会有后面的这种答案?还有:后面句子中的as much as i can 是宾语从句么?请细讲后句的各种结构。

do all/every thing (that) sd can(do)与do what sb can(do)的疑问这两句是省略句,后面跟不定式表目的。如We must do everthing we can_pollution_happy.A.to prevent ; to live B,prevent;to live .....应选A。而:I spend as much tim
all that =what
do all/every thing (that) sd can中从句(that) sd can为定语从句,do what sb can(do)中从句what sb can(do)为名词性从句中的宾语从句,两句意思相近.

你写的这几句是一个意思,是同义句可以互换的,除了这仨,还可以把what换成 whatever