such one and one such

Question

题目：—it's said that the popular record has been sold out.
—what a shame!how i regret that did'nt buy____.为什么是填one such而不是such one

Answer 1

按照限定词与限定词之间不同搭配位置，限定词可分为中位限定词（CENTRAL DETERMINER〕、前位限定词（PREDETERMINER〕和后位限定词（POSTDETERMINER〕。
a) 中位限定词包括a(n), the, zero; this, that, these, those; my, your, etc; Merry's, my friend's; some, any, no, every, each, either, neither, enough; what(ever), which(ever), whose等
b) 前位限定词包括all, both, half; double, twice, three times, etc; one-third, two-fifths, etc; what, such, (a / an)等
c) 后位限定词包括one, two, three, etc; first, second, third, etc; next, last, other, another, etc; many, much, (a) few, (a) little, fewer, (the) fewest, less, (the) least, more, most; several, plenty of, a lot of, lots of, a great / large / good number of, a great / good deal of, a large / small amount of; such等

如果一个名词词组带有上述三类限定词，其搭配关系总是按照"前位－－中位－－后位"的顺序排列。
such如果搭配a/an,放在最前，是前位限定词，否则放最后

这个在大二语法课上会重点讲的，呵呵

Answer 2

强调没有买一个，而用such one强调买了但是不是这种的