Nowhere in nature is aluminium(鋁)found free, owing to its always ______ with other elements, most commonly with oxygen.


  1. A.
    combined
  2. B.
    having combined
  3. C.
    combine
  4. D.
    being combined
A
owing to為介詞短語,后接v.-ing短語作賓語,combine與名詞aluminium是被動關(guān)系,故用被動形式being combined表示“正在被聯(lián)合”,顯然本題無此語境。B、C兩項因為是主動形式,也不符合本題語態(tài)要求。
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