one用作不定代词时,表示泛指,它用来承接前面已出现过的同类可数名词,指同一类中的一个;承接前面出现过的同一个事物时,用it。that用以代替名词,避免重复。指同一种事物,常用“that of...”的形式。1.Id like to buy Father a present with the remaining25dollars,that is not too expensive but useful.A.which B.it C.one D.the one2.There are more than a thousand new buses in the city,and you dont often see that is empty.A.one B.that C.it D.the one3.(N M ET2004Ⅲ)We needed a new cupboard for the kitchen.So Peter made from some wood we had.A.it B.one C.him self D.another4.John didnt do anything at all to appl...