which是什么意思,which怎么读

谁能告诉我这个int which是什么意思
行词the place 做visited的宾语,所以 用代词which做宾语.
do you know the reason ___ he was late? a. for which c.
最后那个考研英语单词which指代什么?turn of是什么意思?
whose book = the book of which = of which the book