－－Is this the PC you ( )from adroad last
mouth?
----That'S ( )
A.had bought;it B.had bought;the one
为什么选Ａ，不选Ｂ？
什么时候用it ，什么时候用the one？　　　　　　　
２.Meeting my uncle after all these years was unforgettable moment,( )I will alaways
treasure.
A.that B.one
C.it D.what

1.第一题选A，因为上文是the PC。
　　对于上文中提到的特定事物，指代的时候用it；
　　通常来讲，在下面这样与this搭配的名词指代的时候用the one，比如：
(1)Is this book （the one） you are looking for?
(2)This classroom is the one where I found your book.
By the way,告诉你一个小技巧，如果你做题时候遇到的是疑问句，你可以自己先把它变做陈述句，通常来讲对于陈述句判断起来更直观，
还是用（１）来举例，在填空的时候Ａ.the one B.it C.one
变做陈述句就是This book is( ) you are looking for .
这样就比较容易判断出选Ａ了吧．
２．这道题我高三的时候也做过，题目是不是有点问题啊，
Meeting my uncle after all these years was an unforgettable
moment,( )I will alaways treasure. 我记得应该是选Ｂ。
因为前文是an unforgettable moment,像这样有不定冠词修饰的名词
后文讲到的时候用one．
　　至于it,指的就是上文提到过的事物：
　　(1)__Is that bike yours?
__Yeah,I'm looking for it!
(2)＿This kind of dictionary is very helpful.
__I think so,I've got one myself.