__modeling business is by no means easy to get into,the good model will always be in demandA While B Since C As D If

__modeling business is by no means easy to get into,the good model will always be in demandA While B Since C As D If
__modeling business is by no means easy to get into,the good model will always be in demand
A While B Since C As D If

__modeling business is by no means easy to get into,the good model will always be in demandA While B Since C As D If
此处明显表示因果:四个答案只有B了,由于...因为...
并无转折关系,while(尽管虽然/当...时候),或者as(正如,就...而言,当...),if(如果/是否)都不恰当
由于modeling行业绝对不容易进入,所以好的modeling总是紧缺.(有需要,销路好,供不应求)
注意的是句子的前半部分和后半部分表示了一种因果关系
只有Since可以连接这种关系
用While语法上没有错误
但是没有表达出句意

D

选D啊！
if …… will be……
如果……，将要……
如果modeling行业不容易进入的话，那么好的Modeling将会一直供不应求了。

选D啊
如果选B,后面就不应该用will always be.

D

__modeling business is by no means easy to get into,the good model will always be in demand
A While B Since C As D If
上面只有"回答者：huihui2043 - 见习魔法师 二级"回答正确,但他给出的理由还有可商榷之处.
很显然这一句主句和从句之间应该表示...

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__modeling business is by no means easy to get into,the good model will always be in demand
A While B Since C As D If
上面只有"回答者：huihui2043 - 见习魔法师 二级"回答正确,但他给出的理由还有可商榷之处.
很显然这一句主句和从句之间应该表示的是一种因果关系,从句讲的是原因.
不过我们都知道since和as都可以用来表示原因,而且都可以用在句首.他们的差异何在?
首先我们看看张振邦先生主编的《新编英语语法》（上海译文出版社出版）原话是怎么说的(一字未改）：
——————
作为原因状语从句的连词，as和since差别不大，带有这类状语分句的复杂句，均侧重主句的内容即原因状语从句所引起的结果，其原因只是附带说明。例如：
As/Since he was not at home, I spoke to his brother.
着重点在I spoke to his brother,这是因为由as/since引导的状语分局，其原因或理由在说话人开来已经很明显，或已为听话人所熟悉，不需加以强调.......由as表示的原因语势最弱......
_______________________________
下面是Michael Swan编写的Practical English Usage一书的（牛津大学出版社出版）的原话：
......
AS and SINCE are used when the reason is already well known, or is less important(注：和because相比而言）than the rest of the sentence. SINCE is a little formal than as. AS- and SINCE-clause often begin the sentence:
As women were not supposed to be novelists, she took the name George Eliot.
Since you refuse to cooperate, I shall be forced to take legal advice.
______________
还有其他的例证不一一列举了。
很显然这题用since和as都可以。
国内考试题目问题很多，胡编乱造并不罕见。这就是中国英语教与学的现状。

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