A turning point of the continuously high housing price won't appear suddenly because there must be a certain process _ many factors lead to the change．
A.which
B.what
C.where
D.that
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C解析试题分析：考查定语从句：句意：房价持续居高不下的拐点不会马上出现，因为导致房价过高的整个过程不是一日形成的，背后有诸多因素。先行词是process，point等等，而且定语从句中缺少地点状语，要用where引导。这是一个由where引导的定语从句。选C。考点：考查定语从句