OG 121 ，为什么？！

fuchengxuan

121.Codex Berinensis, a Florentine copy of an ancient
Roman medical treatise,.is undated but contains clues
to when it was produced. Its first 80 pages are by a
single copyist, but the remaining 20 pages are by
three different copyists, which indicates some
significant disruption. Since a letter in handwriting
identified as that of the fourth copyist mentions a
plague that killed many people in Florence in 1148,
Codex Berinensis was probably produced in that year.

Which of the following, if true, most strongly supports
the hypothesis that Codex Berinensis was produced
in 1148?

(A)Other than Codex Berinensis, there are no
known samples of the handwriting of the first
three copyists.

(B)According to the account by the fourth copyist,
the plague went on for 10 months.

(C)A scribe would be able to copy a page of text
the size and style of Codex Berinensis in a day.

(D)There was only one outbreak of plague in
Florence in the 1100s.

(E)The number of pages of Codex Berinensis
produced by a single scribe becomes smaller
with each successive change of copyist.

这个题十分不解。看了http://forum.chasedream.com/GMAT_CR/thread-512190-1-1.html
这个帖子半天还是觉得很多纳闷的地方。就算之前有很多次瘟疫，那又有什么关系呢，反正这个produce的时间只看最后一个人啊。而最后一个人记载了1148啊
这个题目原文的逻辑都不大清楚是怎么回事。

kevingod

重点在于四个作者中只有一个人提到了瘟疫。首先写书的时间肯定是1148或之后这两种情况。D选项排除了1148年之后这种情况，属于一种"排除其他情况"的加强。
怎么排除的：如果书写在1148年之后，那么应该不止一个copiest会提到。题目中说只有最后一个人提到了，这说明这场瘟疫就发生在1148年，而前三个作者可能没赶上，恰好被最后一个人赶上了！