【題目】This is _______useful book.

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

【答案】A

【解析】句意：這是一本有用的書。不定冠詞a/an表示泛指，a用以輔音音素開頭的單詞前，an用以元音音素開頭的單詞前，定冠詞the表示特指，useful ['jusfl]以輔音音素開頭，前面用不定冠詞a，故答案選A。

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