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

admin2021-08-11  5

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。   
转载请注明原文地址:https://www.kaotiyun.com/show/QhZC777K
本试题收录于: 英语题库成考专升本分类
0

最新回复(0)