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【题目】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:昨天完成作业花了他半小时。半小时,指一小时的一半,表示“一……”,是不定冠词a/an的用法。不定冠词a/an表示泛指,a用在以辅音音素开始的单词前;an用在以元音音素开始的单词前。hour的第一个音[a]是元音音素,前面用不定冠词an。homework是不可数名词,前不能加不定冠词。本题中加定冠词the表示特指。故选B。

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