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— _________ was it _________ they discovered the entrance to the underground palace？

— Totally by chance.

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

— _________ was it _________ they discovered the entrance to the underground palace？
— Totally by chance.

 — _________ was it _________ they discovered the entrance to the underground palace？

— Totally by chance.

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

“How was ______ they discovered the entrance to the underground palace？” “Totally by chance.”

“How was ______ they discovered the entrance to the underground palace？” “Totally by chance.”

    A. it that                             B. he that

    C. it when                             D. he which