--- What do you think of the grammar book?

--- Oh, it really is ________ useful reference book, which is worth reading ________ second time.

A. a; a B. an; the C. an; D. the; the

A

【解析】

試題分析：第一空用不定冠詞表示泛指，useful不是以元音因素開(kāi)頭，不用an ，要用a

；不定冠詞a 與序數(shù)詞連用表示“再，又”，不表示次序，故第二個(gè)空用a，表示再讀一次。

故選A。

考點(diǎn)：考查冠詞

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