高中英语题—关于as______ has already been pointed out,grammar is not

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高中英语题—关于as
______ has already been pointed out,grammar is not a set of dead rules.
A.As B.It C.That D.Which
那个,选as的话不是没有主语了吗?还有,为什么Which不行,长的蛮想非限制性从句的.
我疑惑啊( ⊙ o ⊙ )

As这里是确实是定语从句的先行词.但是你看好,as所引导的定语从句是grammar is not a set of dead rules 也就是说,as是指代这整个后半句的.
为什么不能用which呢?因为which 后面跟的是从句部分,而这里从句部分应该是grammar is not a set of dead rules,——has already been.是主句哦.

高中英语题—关于as______ has already been pointed out,grammar is not _______ has already been pointed out,grammar is not a set of As has already been pointed out,grammar is not a set of dead ___ has already been pointed out,grammar is not a set of dea (1)_____has already been pointed out,fast reading is importa 英语翻译As has been pointed out before,air pollution is becoming 英语翻译（）has been pointed out before,air pollution is becoming As has been said above,grammar is not a set of dead rules. In these cost-consious times ,it has even been pointed out i the man pointed out that the forms had not been properly fil 用...has/have already been...but...not...yet.造句 he has pointed out that the tree is a useful source of incom