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【题目】To build a road in the mountainous area is ________ real challenge.

A.aB.anC.theD./

【答案】A

【解析】

句意:在山区修建道路真是一种挑战。

a/an,不定冠词,表示泛指,意为“一个”,a用于辅音音素前;an用于元音音素前;the定冠词,表示特指,意为 “这,那”; /代表不填写冠词。此处表示介绍“一种真正的挑战”,real以辅音音素开头,故选A

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