2. 外语
  3. ______ scientists to develop a vaccine for the bird flu virus, they could potentially help save millions of lives.

______ scientists to develop a vaccine for the bird flu virus, they could potentially help save millions of lives.

admin2012-04-26  31
问题 ______ scientists to develop a vaccine for the bird flu virus, they could potentially help save millions of lives.
选项 A、If
B、Should
C、Were
D、Unless
答案C
解析 were to虚拟语气倒装句
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