下面几句英语句子,The biggest challenge will be to distinguish themse

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下面几句英语句子,
The biggest challenge will be to distinguish themselves from a plethora of competitive sites,most of which are spending more than they are. (这句有问题吗?最后more than they are.. 后面指代的是什么?)
To stand out from the crowd,Helle are working to target and reach their audience better,and generate higher sales,but of necessity without incresing their budget.（这里的 of necessity 相当于 necessary ,但不应该用副词吗?necessarily）

The biggest challenge will be to distinguish themselves from a plethora of competitive sites, most of which are spending more than they are. 此句没有问题.most of which are spending more than they are是一个非限制定语从句,修饰前面的competitive sites.意思是多数的这些competitive sites的花费比they要多.
of necessity本身就是副词词性,相当于necessarily.
再问：不应该用more than they have 吗？ of necessity 是固定格式吗？ of + noun 不是可以转换成形容词吗？怎么变成了副词的？
再答：在比较级中，than的前后句子时态要相同，这是一个基本原则。than后面的they are实际是they are spending的略写。是的，of+名词，可以转换为形容词，但这不是唯一原则。of necessity确实是副词词性，这是事实。

下面几句英语句子,The biggest challenge will be to distinguish themse 分析几句英语句子!1.success or failure will,in the end,be determined 1,Secondly,people should be educated to distinguish the righ AIDS is said to( have been)the biggest challenge to human ov Disneyland will be the biggest park in Shanghai(保持句意基本不变） Aids is said_____ the biggest health challenge to both men a My biggest challenge is learning how to behave at the dinner My biggest challenge is learing how to b----- at the dinner 英语翻译AIDS is said------the biggest health challenge to both m 分析句子结构,The next thing for business is to be the biggest and rising to the challenge What is the biggest challenge in the life