【題目】It took him half hour to finish homework yesterday.
A.a; an
B.an; the
C.a; the

【答案】B
【解析】句意:昨天完成作業(yè)花了他半小時(shí)。半小時(shí),指一小時(shí)的一半,表示“一……”,是不定冠詞a/an的用法。不定冠詞a/an表示泛指,a用在以輔音音素開始的單詞前;an用在以元音音素開始的單詞前。hour的第一個(gè)音[a]是元音音素,前面用不定冠詞an。homework是不可數(shù)名詞,前不能加不定冠詞。本題中加定冠詞the表示特指。故選B。

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