Nowhere in nature is aluminum found free, _____ its always being combined with elements, most commonly with oxygen.

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问题 Nowhere in nature is aluminum found free, _____ its always being combined with elements, most commonly with oxygen.

选项 A、referring to
B、except for
C、regardless of
D、owing to

答案D

解析 本题答案是D。owing to意为“由于,因……之缘故”。根据题意可知,这是一个有因果关系的句子,因此D项为正确答案。其他三项词义:referring to意为“参考,查阅;涉及,提到;指的是”;except for意为“除……以外”;regardless of意为“不管,不顾”。
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