It was in the stone house _____ was built as a school by local villagers _____ the boy finished

his primary school. [ ]

A. which; that

B. that; where

C. which; where

D. that; which

天车的油道内润滑脂不清洁时，会出现滑轮（）的故障。

A、转动有杂声

B、严重阻卡

C、不转

D、轴承发热