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 |
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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 |