They studied what since 2007 and found Australian electricity prices were among the highest in the developed world.
A. has happened
B. happened
C. had happened
D. has been happening
They studied what since 2007 and found Australian electricity prices were among the highe
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解决时间 2021-01-21 02:49
- 提问者网友：王者佥
- 2021-01-20 14:06
最佳答案
- 五星知识达人网友：梦中风几里
- 2020-06-13 23:05
A. has happenedB. happened(答案→)C. had happenedD. has been happening解析：考查时态。根据studied知道句子本身是过去时，2007年发生的事情正是研究的对象，说明他们是在研究之前发生的，所以应该使用过去完成时。
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- 1楼网友：拜訪者
- 2019-04-06 02:36
对的，就是这个意思
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