They arrived at a farmhouse in front of sat a small boy. A. whom B. who C. 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

(答案→)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.