2. 外语
  3. The second injection should only have been given once the first drug had taken effect.

The second injection should only have been given once the first drug had taken effect.

admin2009-06-15  26
问题 The second injection should only have been given once the first drug had taken effect.
选项 A、taken place
B、injected
C、worked out
D、worked
答案D
解析
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