—People often don't appreciate what they have, do they?
—No, _____ they lose it.
A．ifB．a(chǎn)fterC．whenD．until
D               
             
試題分析：考查連詞辨析。A. if  如果；B. after在。。之后；C. when當(dāng)。。時(shí)候；D. until 直到；句意：人們并有在意他們所擁有的，是嗎？不，直到他們失去時(shí)候。根據(jù)句意，故選D項(xiàng)。        
考點(diǎn) : 考查連詞辨析
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