Amazing     it is, an astronaut’s superior position is filled with potential danger.
A．whenB．ifC．unlessD．a(chǎn)s
D

試題分析：句意：正如很令人驚奇一樣，一位宇航員高級的職位也充滿著潛在的危險。When當(dāng)……時候；if如果；unless除非；as正如，選D。
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