It is not immediately clear __________ the housing price will go down.
A．howB．whatC．thatD．whether
D               
             
試題分析：考查主語從句。句意：房價是不是會下降這事還不太明確。It是形式主語，真正主語是后面的主語從句，根據(jù)not clear，可推知用whether， 這種類型的題注意整體句意的協(xié)調，再來判斷用哪個引導詞，故選D項。         
考點 : 考查主語從句
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