单选

根据某项调查,参加软件资格考试的考生使用参考书的情况为:50%的考生使用参考书A;60%的考生使用参考书B;60%的考生使用参考书C;30%的考生同时使用参考书A与B;30%的考生同时使用参考书A与C;40%的考生同时使用参考书B与C;10%的考生同时使用以上3种参考书。则仅使用其中两种参考书的考生百分比为(64)。

  • A.70%.
  • B.80%.
  • C.90%.
  • D.100%.
参考答案
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