We’ve just installed two air-conditioners in our apartment, ______ should make great differences in our life next summer.[2002]

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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.[2002]

选项 A、which
B、what
C、that
D、they

答案A

解析 非限定性定语从句起补充说明作用,用逗号与主句隔开,which充当该从句的引导词,所以A为正确答案。what引导名词性从句,作主语和宾语;that不可引导非限定性定语从句;they不是关系代词,不能引导定语从句。
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