问题补充：
Last Sunday, they arrived at the farm they had never paid a visit before.
A. that
B. which
C. to which
D. for which
答案：
A. that
B. which
(答案→)C. to which
D. for which
解析：考查定语从句，先行词the farm，关系词前要用介词to因为要与从句中paid a visit构成短语。句意：上周六他们到达了那家农场，那家他们以前从未参观的农场。
