The earth will become worse and worse ________ we do something to stop her from being polluted.
A．ifB．even ifC．whenD．unless
D              
             
試題分析：考查連詞辨析。 If 如果；ever if 即使；when 當(dāng)。。時(shí)候；unless除非。句意：除非我們做一些事情來阻止它被污染否則地球會(huì)變得越來越糟糕。Unless 相當(dāng)于 if not ,根據(jù)題意可知，這是個(gè)條件句，所以選D項(xiàng)。          
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