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(yǔ)從句。句意：房?jī)r(jià)是不是會(huì)下降這事還不太明確。It是形式主語(yǔ)，真正主語(yǔ)是后面的主語(yǔ)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(diào)，再來(lái)判斷用哪個(gè)引導(dǎo)詞，故選D項(xiàng)。         
考點(diǎn) : 考查主語(yǔ)從句
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