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

问题补充：

--- 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

答案：

A. What; that

(答案→)B. How; that

C. When; how

D. Where; that

解析：本题考查强调句，强调部分应为方式状语。