2. 外语
  3. First aid can save a person’s life if ______ immediately and properly.

First aid can save a person’s life if ______ immediately and properly.

admin2014-08-25  22
问题 First aid can save a person’s life if ______ immediately and properly.
选项 A、perform
B、performing
C、performed
D、to perform
答案C
解析 补充完整的从句为if first aid is performed immediately and properly。
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