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--__________ was it_________ they discovered the entrance to the underground place?

   --Totally by chance.

   A. How; that    B. What ; that    C. When; when    D. Where; that

--__________ was it_________ they discovered the entrance to the underground place?

   --Totally by chance.

A. How; that    B. What; that    C. When; when       D. Where; that

--__________ was it_________ they discovered the entrance to the underground place?

--Totally by chance.

A. How; that    B. What ; that    C. When; when    D. Where; that

--__________ was it_________ they discovered the entrance to the underground place?

--Totally by chance.

A. How; that    B. What ; that    C. When; when    D. Where; that

--__________ was it_________ they discovered the entrance to the underground place?

--Totally by chance.

A. How; that　 B. What ; that　 C. When; when　 D. Where; that