-- was it they discovered the entrance to the underground place?--Totally by chance.A. How

问题补充：

-- 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

答案：

(答案→)A. How; that

B. What ; that

C. When; when

D. Where; that

解析：本题是强调句的考查。考生可以将问句转为陈述句语气，这样题意就比较清晰：“It was how that they discovered the entrance to the underground place．”