We’ve just installed two air-conditioners made in Shanghai in our apartment, ________ should make great differences in our life next summer．

A.which

B.what

C.that

D.they

答案及解析： A

解析：

试题分析：本题考查关系代词的用法。详细

解答：这是一个非限制性定语从句，此处缺少一个关系代词；由于该非限制性定语从句先行词是air-conditioners，所以关系代词应用which。