英语复合句选择题____are playing an important part is well known to us all.A.That whoB.Who thatC.Who我的理解A中that引导主语从句,而who引导定语从句修饰thatB中Who引导主语从句,that引导定语从句修饰whoC中who引导

英语复合句选择题____are playing an important part is well known to us all.A.That whoB.Who thatC.Who我的理解A中that引导主语从句,而who引导定语从句修饰thatB中Who引导主语从句,that引导定语从句修饰whoC中who引导
英语复合句选择题
____are playing an important part is well known to us all.
A.That who
B.Who that
C.Who
我的理解A中that引导主语从句,而who引导定语从句修饰that
B中Who引导主语从句,that引导定语从句修饰who
C中who引导主语从句.
答案是C,求前两种理解错误之处.

英语复合句选择题____are playing an important part is well known to us all.A.That whoB.Who thatC.Who我的理解A中that引导主语从句,而who引导定语从句修饰thatB中Who引导主语从句,that引导定语从句修饰whoC中who引导
____are playing an important part is well known to us all.
A.That who
B.Who that
C.Who
我的理解A中that引导主语从句,而who引导定语从句修饰that
B中Who引导主语从句,that引导定语从句修饰who
C中who引导主语从句.
答案是C,求前两种理解错误之处.
答：这是一道有问题的人工考题.
析：本题考查的是名词性从句的主语从句.谓语是is well known to us all.
从谓语的表述来看,主语从句应为一个事实,多为由that引导的一个陈述句变过来的主语从句,如：That the earth goes around the sun is well known to us all.
译：地球绕太阳转,这件事我们大家都知道.
Who are playing an important part 是一个特殊疑问句,是一个问题.不是陈述句,不是一个事实,所以不用that-引导名词性从句.而直接可以用连接代词（副词）即wh-词引导名词性从句.这个名词性从句由特殊疑问句变来,还带有疑问的意思,如作主语,系表常为：is not clear,is still unknown之类的.如
Who will be our new English teacher is not clear/ is still unknown.
谁将是我们的新英语老师（这个问题）现在还不清楚.（仍不知道）.
当然,what,when,where,why这三个连接代词和连接副词,除了引导由特殊疑问句变来的名词性从句外,还可以引导一个相当于一个名词+定语从句的纯名词（无疑问意义）的名词性从句.
如：What he said is important.=The thing that he said is important.(所说的话,不是“什么?”）
When he joined the army is known to us all.=The time when he joined the army is known to us all.（参军的时间,不是“何时?”）
This is where Luxun was born.=This is the place where LuXun was born.(出生地,不是“在哪里?”
That's why he was late.=That's the reason why he was late.(理由,不是“为什么?”）
Whatever,whoever 这两个词,可以引导纯名词性从句=anything that-从句和anyone who-从句
如：Whoever breaks the law should be punished.=Anyone who breaks the law should be punished.
任何一个犯法的人（不是“谁”）.
照理who与what一样,除了引导由特殊疑问句变来的名词性从句外,也能引导纯名词性的从句的.可实际上除了whoever引导的纯名词性从句外,很少见到由who引导的这类名词性从句.
本题句就是想作这方面的尝试.
即使可以这样who=the person(s),则这一题句的主谓一致问题没有解决好.
如果纯名词性的主语从句Who are playing an important part =the persons who are .,则主语是一个复数概念.与is well known不一致.
如果是一个问题,则系表应改为：is not known yet.之类的：
Who are playing an important part is not known yet.
译：谁正起到一个重要的作用,这个问题现在还不知道.