（）the earth truns around the sun is known to us all.A.that B.what C.which D.the fact
题目
（）the earth truns around the sun is known to us all.A.that B.what C.which D.the fact
答案
选A.这是that引导主语从句,it 作形式主语,that 不能省略.例如：That she is a rich woman is known to us all.众所周知,她是个富有的女人.这句话可以改为用it 作形式主语的句型：It is known to us all that she is ...
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已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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