①one 代替可数名词，表示泛指; the one 表示特指; that代替不可数名词 ，表示特指; 它们都可以代替前面提到的同一类事物; it指前面提到的同一事物。
There is an old engineer and a young one here.
His attitude to me is that of a friend.
I’ve lost my pen. Have you seen it? (Have you lend me one?)
② the / this / that / these / those + adj. + one / ones
I’ll try on a few of these shirts. Please pass me that white one.
③the one后面可以接介词短语或定语从句
The boy in your class is taller than the one in our class.
The skirt (that) she made herself is more beautiful to wear than
the one (that) she bought last year.
④ one 不能代替前面提到的不可数名词
Don’t use powdered milk. Use this fresh milk. (不可用 fresh one)
⑤those , ones
These machines are better than those we made last year.
---I’d like a pound of apples.
---Which ones?
---The red (ones).
---Why don’t we take a little break ?
---Didn’t we just have ? (NMET2000)
A. it
B. that
C. one
D. this
(C)
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