We’ve just installed two air-conditioners in our apartment, ______ should make g

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

选项 A、which
B、what
C、that
D、they

答案 A

解析关系代词题。非限定性定语从句起补充说明作用，既可修饰先行词，也可修饰整个主句，用逗号与主句隔开，which可以充当该从句的引导词，所以[A]为正确答案。[B]what引导名词性从句，作主语和宾语；[C]that不可引导非限定性定语从句；[D]they不是关系代词，不能引导定语从句。

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