2. 外语
  3. Voluntary and non-remunerated donation may be sufficient for a country or a region Ato cover all its blood product needs, but Br

Voluntary and non-remunerated donation may be sufficient for a country or a region Ato cover all its blood product needs, but Br

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问题 Voluntary and non-remunerated donation may be sufficient for a country or a region Ato cover all its blood product needs, but Brequire an efficient organization and the elimination of "spurious Altruism", non-monetary forms of compensation Cthat harm the social image of voluntary donation and obstruct Dits further development.
选项 A、 
B、 
C、 
D、 
答案B
解析 谓语动词require所在句子的主语是donation，是单数名词，因此应将require改为requires。
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