2. 外语
  3. The machine _____, the next step was how to operate it.

The machine _____, the next step was how to operate it.

admin2013-07-24  52
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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四川省大学英语三级

大学英语三级

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