We arrived at a farmhouse in front of .A. it sat a smallB. which a small boy sat there C.

问题补充：

We arrived at a farmhouse, in front of .

A. it sat a small

B. which a small boy sat there

C. which sat a small boy

D. it was a small boy

答案：

A. it sat a small

B. which a small boy sat there

(答案→)C. which sat a small boy

D. it was a small boy

解析：考查定语从句和倒装，从句子结构，可知这是非限制性定语从句，介词in front of后面接which，另外in front of which在定语从句中是地点状语，后面要完全倒装。谓语动词在主语前面。句意是：我们到了一个农舍，前面坐着个小男孩。选C。