is necessary for us read good books.A. It to B. That to C. It \

问题补充：

is necessary for us read good books.

A. It, to B. That, to C. It, \

答案：

解析：

试题分析:强调句式， It is adj for sb to do sth，做某事对某人来说怎么样。本句中it是形式主语，指代后面不定式内容做形式主语，that无此用法。句意：读好书，对于我们来说很必要。故选A。