The fact has worried the people across the world ______ the earth is being warmer and warmer these years.A.whatB.whichC.thatD.where
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C解析：考查同位语从句。同位语从句that the earth is being warmer and warmer these years对前面的the fact的内容进行解释说明。That起引导作用，不充当任何成分，没有任何意义。故C正确。