关于that 和 one
问题描述：
关于that 和 one
this kind of book is rather easy.you needn't keep _____.
A that
B one
请说说为什么不选A
答
that是指代上文已经提到的事情,而one是泛指.上文说this kind of book,这说明是这一类书,是泛指,所以选one