2. 外语
  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.

admin2008-11-13  30
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。
转载请注明原文地址:https://kaotiyun.com/show/nsJO777K
0

成人本科学位英语

相关试题推荐
随机试题
最新回复(0)