Question

There was a time______we went to the country and stayed with the farmers there.

1. A.
   which
2. B.
   that
3. C.
   when
4. D.
   while

Answer 1

C
考查定语从句，这是一个固定句型There was a time when 曾经有一段时期，句意：曾经有一段时期我们去了乡下和那的农民呆在一起。所以选C。