The owner of the cinema needed to make a lot of improvements and employ more people to keep it running, ________ meant spending tens of thousands of pounds．Make your enemy your friend．化敌为友。A.whoB.thatC.asD.which
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D解析本题考查which引导的非限制性定语从句，并且在定语从句中，它是句子的主语。而as只能作主动语态的宾语或被动语态的主语；that不能引导非限制性定语从句。A项只能修饰表示人的先行词，所以D项为正确