We are flying at altitude of 6,000 meters and perhaps we will get there at midnight.A.the; theB.an;

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【题目】We are flying at _____ altitude of 6,000 meters and perhaps we will get there at _____ midnight.
A.the; the
B.an; the
C.an; /
D.the; /

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【答案】C
【解析】句意：我们在海拔6千米处飞行可能午夜到那。at an altitude of+数字“在海拔……处”， altitude开头是元音音标，前用an.“在午夜”用at midnight，是固定短语。故选C。