Question

---______ the farmers discovered the entrance to the secret cave in the valley?
--- Totally by chance.

1. A.
   When was it that
2. B.
   How was it that
3. C.
   How it was that
4. D.
   When it was that

Answer 1

B
试题分析：通过分析句子结构，可知这是一个特殊疑问句的强调句，基本结构是“特殊疑问词 + is/ was + it that……”因为把强调句的基本结构is/ was + it that去掉仍然是一个完整的句子，所以是强调句。