The whole book ________ twelve units, ________ two that are mainly for revision.A.contains; includingB.includes; containingC.contains; containingD.includes; including
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A解析contain一般“包含”得是一个整体，侧重“内有”的意思；include往往包含的是整体的一个部分或几个部分，including在这里是介词。依题意A为最佳选项。