◎ 题干
—You've dropped _____ "s" in the word "necessary".
—Oh, _____ letter "s" is doubled.           
[     ]
A. a; a            
B. a; the
C. an; the        
D. the; the
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“—You've dropped ______ "s" in the word "necessary".—Oh, ______ letter "s" is doubled. [ ]A. a; aB. a; the C. an; theD. the; the …”主要考查了你对  【定冠词(the)】【不定冠词(a,an)】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。