英语专业四级词汇语法练习题(二)1. Nowhere in nature is aluminum found free， owing to its always_with other elements， most commonly with oxygen.A. being combined B. having combined C. to combine D. combined2. Physics is the present day equivalent of _used to be called natural philosophy， from _ most of present day science arose.A. which， what B. that， which C. what， which D. what， that3. On no account _ever leave the baby at home alone.A. should you B. you should C. shall you D. you s
