Audio - video ________ and recreational ________ should be installed in the language centre．A.equipment … facilitiesB.equipments … facilitiesC.equipments … facilityD.equipment … facility
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A解析equipment表示“设备”是不可数名词，而facility表示“设施”时常用复数形式facilities．因此Audio - video equipment表示“视听设备”，recreational facilities表示“休闲设施”。