2. 外语
  3. (Over) (the past) few years, medical researchers (are searching) for a means (to control) AIDS virus

(Over) (the past) few years, medical researchers (are searching) for a means (to control) AIDS virus

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问题 (Over) (the past) few years, medical researchers (are searching) for a means (to control) AIDS virus
选项 A、Over
B、the past
C、are searching
D、to control
答案A
解析 应改为have been searching。根据前后句意应该用现在完成进行时have been searching表示过去发生的事持续到现在。
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