They arrived at a farmhouse in front of sat a small boy.A. whomB. whoC. whichD. that

问题补充：

They arrived at a farmhouse，in front of sat a small boy.

A. whom

B. who

C. which

D. that

答案：

A. whom

B. who

C. which

D. that

解析：in front of which即in front of a farmhouse。In front of which在从句中作状语。