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Nowhere in nature is aluminium(铝)found free, owing to its al

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Nowhere in nature is aluminium(铝)found free, owing to its always ______ with other elements, most commonly with oxygen.
A. combined
B. having combined
C. combine
D. being combined
答案A
owing to为介词短语,后接v.-ing短语作宾语,combine与名词aluminium是被动关系,故用被动形式being combined表示“正在被联合”,显然本题无此语境.B、C两项因为是主动形式,也不符合本题语态要求.