2. 外语
  3. All the lights ______ before we left the office.

All the lights ______ before we left the office.

admin2014-10-11  29
问题 All the lights ______ before we left the office.
选项 A、has been turned off
B、have turned off
C、had been turned off
D、had turned off
答案C
解析 我们离开办公室之前把所有的灯都关上了。
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