that is 和as is的区别
问题描述：
that is 和as is的区别
______is known to the world ,Mark Twain is a great American writer
A,That
B,As
为什么要选A呢,选A的话前面不就是一个句子了么?那还用逗号隔开不是矛盾了么?为什么不能选B呢,谢谢各位了
暂时还不能确认谁正确呢
答
That 代指后面的句子mark twain is a great american writer.
双重主语