【題目】A little boy wrote ________ "u" and ________"n" on the wall.
A.a; an
B.an; a
C.an; an
D.a; a

【答案】A
【解析】句意:一個(gè)小男孩在墻上寫(xiě)了一個(gè)u和一個(gè)n。英語(yǔ)中不定冠詞泛指任何一個(gè),其主要有兩種形式。a 用于輔音音素開(kāi)頭的單詞前,an用于元音音素開(kāi)頭的單詞前。根據(jù)被修飾詞u和n,單數(shù)名詞,前者的第一個(gè)因素是輔音因素,故用a;后者的詞首音素為元音音素,故用an。故選A。

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