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问题: This exercise is ___ difficult ____.

This exercise is ___ difficult ____.
A.so;that few of us can do it.
B.too; for anyone of us to do it

解答:

答案选A
so ......that 是引导从句
so that
conj.
所以
其实B不对的理由很简单:anyone后不能跟of介词短语,即:没有anyone of sb形式。
B的句子是This exercise is too difficult for anyone of us to do it.我先举个例子你看看:The question is easy to answer.和The question is easy to answer it.比较一下,哪个对?第二句多了个it,这个it 完全是多余的因为句子成分一点都不缺.上面的题也是如此,它是一个单句,而so...that句式是复句,所以必须有it 补足成分.