【題目】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; /

【答案】C
【解析】句意：我們?cè)诤０?千米處飛行可能午夜到那。at an altitude of+數(shù)字“在海拔……處”， altitude開頭是元音音標(biāo)，前用an.“在午夜”用at midnight，是固定短語。故選C。

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