2. 专升本
  3. Over the past few years medical researchers______for a means of controlling the virus.

Over the past few years medical researchers______for a means of controlling the virus.

admin2012-05-24  59
问题 Over the past few years medical researchers______for a means of controlling the virus.
选项 A、have searching
B、are searching
C、have been searching
D、search
答案C
解析
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