This book is ________ that one, but ________ than that one．A.as difficult as; expensiveB.as more difficult as; more expensiveC.as difficult as; more expensiveD.more difficult as; as expensive
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C解析选C。根据(not)as+形容词/副词原级+as的用法，排除B、D，再根据第二个句中的than，判断此句应为比较级，故选C。