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Yang Liwei’s journey into ____ space took him 600,000 kilometres in ____ orbit, around the earth 14 times, in just over 21 hours.

A.a, an B.the, an C.不填,不填 D.the, the
科目 英语   题型 单选题   难度 较易
知识点: 冠词的用法辨析
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