Putting a candle in the window ___ a traditional practice in many cultures, ____ has a variety of meanings in the United States．A.was; thatB.is; itC.has been; whichD.had been; which
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C解析考查时态及定语从句。根据从句中的动词has，可推断出上句的动作一直持续到现在。第二空用which，指前半句的含义。句意：在窗户上放一只蜡烛是许多文化的一个传统惯例，这在美国有各种各样的意思。所以选C。