partofwhichitwas.一个奇怪的定语从句,NCE3中的一句：Themostvaluablefindofallwastheship'slogbook,partsofwhichitwasstillpossibletoread.partsofwhich后一句是作为定语从句,修辞logbook,为什么还有一个

Question

part of which it was .一个奇怪的定语从句,
NCE3中的一句：
The most valuable find of all was the ship's log book,parts of which it was still possible to read.
parts of which后一句是作为定语从句,修辞 log book,为什么还有一个 it呢,一般应是 a book which is very interesting.这种形式的吧?

Answer 1

应该是 it was still possible to read parts of log book.但是这里用which代替了log book,同时which引导定语从句时之前可以用介词,所以这句应该是一个介词短语前置的定语从句．