题干
—Could you say something about Turkey’s downing of the Russian fighter jet?
—Sorry. It ______ by a group of experts and will be made clear the moment they get the answer.
—Sorry. It ______ by a group of experts and will be made clear the moment they get the answer.
| A．has been investigated | B．is being investigated |
| C．was investigated | D．was being investigated |
答案(点此获取答案解析）
