1.We could ask someone to do the work privately without it____.A) know   B) be known   C) being known   D) to be known 我这参考答案是C,网上查询有人选D,到底是哪个答案对,2.The reason for all the changes being made ____

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1.We could ask someone to do the work privately without it____.
A) know   B) be known   C) being known   D) to be known
我这参考答案是C,网上查询有人选D,到底是哪个答案对,
2.The reason for all the changes being made ____to us yet.
A) has not explained   B) has not been explained
C) did not explained   D) were not explained
我这参考答案是B,还有这里的being是个什么用法,为什么选B,

1 准确答案选C
这个题其实是在考without结构,我们可以类比with的用法
如果把它独立出来就应是:it is known但是因为用了without使它成了句子的状语,它就不能再用is形式,而应用分词形式来降级,所以把is改成being
2 选B当然是正确的
这个句子的主语是the reason,后面的yet说明应用完成时,reason与explain是被动关系,所以B很好选出来,关键是being的用法
这个句子的主干是:The reason has not be explained yet,for all the changes being made是定语修饰reason的,而being made是修饰changes的,首先我们知道,非谓语动词是可以作定语的,包括现在分词,过去分词和不定式,现在分词表主动进行,过去分词表被动完成,changes与make是被动关系,所以用made,但这里为什么要加being呢?这就是一个很灵活的用法了,语法书上是不会讲的,全靠自己迁移运用.这里其实是迁移了被动语态的进行时,由这个句子
The changes are being made 迁移而来,它在这里加上一个being只是为了突出这是变化是正在做出的.
不知道我给你讲懂了没有?

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