2. 外语
  3. ______ halfway through the experiment, there was a power failure and the teacher told us to stop.

______ halfway through the experiment, there was a power failure and the teacher told us to stop.

admin2008-11-13  15
问题 ______ halfway through the experiment, there was a power failure and the teacher told us to stop.
选项 A、When we were only
B、Being only
C、When only
D、Having been
答案A
解析
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