19．Aluminum isn't found free in nature，owing to its always ______ with other elements，most commonly with oxygen． （　�。�
A．being combinedB．having combinedC．combineD．combined

分析 在自然界中發(fā)現(xiàn)的鋁不是獨立存在的，因為鋁和其它元素結(jié)合在一起，通常情況下是和氧在一起．

解答 答案是A．本題考查動名詞的被動語態(tài)；題干中owing to中的to是介詞，故它的后面應(yīng)跟動名詞，這里是its+動名詞也就是動名詞的復(fù)合結(jié)構(gòu)．combine …with…與…結(jié)合；可見及物動詞combine后缺少賓語，its與combine之間是被動關(guān)系，故用being combined，故選A．

點評 首先判斷選項中的動詞在句中是以謂語還是非謂語形式出現(xiàn)，然后根據(jù)選項在句中的功能結(jié)合非謂語的基本用法做出合理的判斷．要關(guān)注常見非謂語動詞的搭配．

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