Once infected with HIV, the body is unable to ________ itself against diseases．


  1. A.
    defend
  2. B.
    judge
  3. C.
    save
  4. D.
    prevent
A
解析：
根據(jù)句意可知應(yīng)該是同疾病作斗爭，故用defend。prevent意為“阻止”，放在這里與題意不符，因此排除D項(xiàng)。
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