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  3. (The metal) aluminum (has been) (first) isolated (early) in the nineteenth century.

(The metal) aluminum (has been) (first) isolated (early) in the nineteenth century.

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问题 (The metal) aluminum (has been) (first) isolated (early) in the nineteenth century.
选项 A、The metal
B、has been
C、first
D、early
答案B
解析 应改为was。本句中有具体表示过去的时间状语，所以应该用一般过去时态。   
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