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【题目】—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】C
【解析】句意:-你丢了一个“s”在“necessary”这个词中。—哦,字母“s”是两个。英语中的冠词分为不定冠词和定冠词。不定冠词有两个,a 和 an。a用在辅音开头的单词前面;an用于以元音开头的单词前。不定冠词用在单数可数名词前面,表示这个人或事物是泛指的不确定的一个,相当于中文的“一个”。定冠词和名词连用,表示某个或某些特定的人或东西。字母S的第一个音发元音。所以选C。

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