______ is the center of our planetary system was a difficult concept to grasp in the Middle Age.
题目
______ is the center of our planetary system was a difficult concept to grasp in the Middle Age.
答案是That the sun and not the earth.
为什么Being the sun and not the earth.不可以呢
不是非谓语吗,可以做为主语从句中的主语部分啊
答案
动名词才可以作主语
举一反三
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
最新试题
热门考点