（）is certain is（）the mystery of Stonehenge has never been fully explained.
（）is certain is（）the mystery of Stonehenge has never been fully explained.
A.It， that
B.What， what
C.It， what
D.What， that
正确答案：D
★《布宫号》提醒您：民俗信仰仅供参考，请勿过度迷信！
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