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

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

admin2009-06-15  39
问题 The second injection should 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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