【題目】—This is ____________ useful book, I think.
—So it is, and it's ____________ unusual one.
A.an; /
B.an; an
C.a; an
D.a; a

【答案】C
【解析】不定冠詞表示數(shù)量一,useful是輔音音素開頭,用a; 而unusual則是元音音素開頭,故用an。句意:—這是一本很有用的書,我認為!拇_是,而且它是一本不尋常的書。故選C。

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