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

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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 逗号后是非限制性定语从句,需要填入引导词,故A项which正确。B项what和C项that都不能引导非限制性定语从句;D项they能充当后一分句的主语,但两个分句间无连词,语法上同样不正确。
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