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Nowhereinnatureisaluminumfoundfree,owingtoitsalways____withotherelements,mostcommonlywithoxygen.

A、beingcombined
B、havingcombined
C、tocombine
D、combined
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正确答案:

A

答案解析:

【句意】 由于铝总是和其它元素结合在一起,最常见的是和氧气在一起,所以自然界中哪里也不会找到单独的铝元素。

【难点】 owing to 是介词,后应接名词或动名词,根据题意,应接被动语态形式。

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