The farmer used wood to build a house to store grain.A. thatB. in whichC. whichD. what

问题补充：

The farmer used wood to build a house to store grain.

A. that

B. in which

C. which

D. what

答案：

A. that

(答案→)B. in which

C. which

D. what

解析：考查定语从句。后面接的是一个地点状语从句。To store grain in a house。而前面的先行词是a house。所以选择 in which。