Every ________ been tried to save the patient．


  1. A.
    mean has
  2. B.
    means has
  3. C.
    mean have
  4. D.
    means have
B
解析：
every只能接單數(shù)可數(shù)名詞，而means是單復(fù)數(shù)同形的單詞，故謂語(yǔ)動(dòng)詞用單數(shù)；當(dāng)these, all修飾means時(shí)，謂語(yǔ)動(dòng)詞用復(fù)數(shù)．
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[　　]

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B．means has

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