摘要： is certain is the mystery of Stonehenge has never been fully explained. A. It, that B. What, what C. It, what D. What, that
网址：http://m.1010jiajiao.com/timu3_id_3000423[举报]
_____ is certain is ______ the mystery of Stonehenge has never been fully explained.
- A.It, that
- B.What, what
- C.It, what
- D.What, that
_____ is certain is ______ the mystery of Stonehenge has never been fully explained.
| A．It, that | B．What, what |
| C．It, what | D．What, that |