39 How can we prove that the drugs have wiped out the remaining virus?Ay using

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问题
39 How can we prove that the drugs have wiped out the remaining virus?

选项 Ay using up a" the drugs at once.
By waiting for the virus to die slowly.
Cyanalyzingthetreatmentrecordthoroughly.
Dy stopping the drugs and see if the virus comes back-

答案D

解析倒数第三段倒数第二句就明确说到,“要证明病毒是否被消灭的唯一方法就是停药以 后看看病毒是否重新出现”,其他三个选项短文均未提到。
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