By looking at a problem in as many ways as possible, creative thinkers can find solutions(解决办法)that could ________ remain invisible(看不见的)．A.otherwiseB.yetC.alreadyD.forever
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A解析otherwise意为“否则，要不然的话”；yet意为“还，依然，已经”；already意为“已经”；forever意为“永远”。根据句意应选A项，表示“否则会是看不见的”。