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The explorers found island.There’s no plants on it.

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

B 【解析】句意:这个探险家发现一个岛屿,上面没有植物。不定冠词a/an一个,表泛指,a用于辅音因素开头的单词前,an用于元音因素开头的单词前;定冠词the这个,那个,通常表特指,故选B
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