Despite the development of a vaccine(疫苗), measles(麻疹)______ still a serious danger to adult victims.

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问题 Despite the development of a vaccine(疫苗), measles(麻疹)______ still a serious danger to adult victims.

选项 A、is
B、are
C、was
D、were

答案A

解析 本题考查主谓一致,主语measles"麻疹",疾病的名称,是单数,所以谓语也应用单数。题意为,尽管开发了疫苗,麻疹对于成年的患者仍然是严重的威胁。
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