An idea suddenly came to J.K. Rolling ________ she could write a book about people living in the magic world.A.ifB.whenC.thatD.which
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C解析句意：J.K. Rolling突然想起一个主意，那就是她为生活在魔法世界中的人们写一本书。本句考查同位语从句that she could write a book about people living in the magic world作an idea的同位语。