2. 职称英语
  3. The machine _____, the next step was how to operate it.A、having been installedB

The machine _____, the next step was how to operate it.A、having been installedB

游客2024-08-04  31
问题 The machine _____, the next step was how to operate it.
选项 A、having been installed
B、had been installed
C、having being installed
D、has been installed
答案 A
解析
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