.We can never expect _________ bluer sky unless we create _________ less polluted world.
A.a(chǎn);aB.a(chǎn);the
C.the;aD.the;the
A

句意為:如果我們不創(chuàng)造一個(gè)環(huán)境污染減少的世界,我們永遠(yuǎn)不會(huì)期望擁有一個(gè)更藍(lán)的天空。根據(jù)句意,a bluer sky和a less polluted world為可數(shù)名詞表示泛指,所以用不定冠詞。
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