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First aid can save a person's life if ______ i

2022-08-06 11:23:08 问答库阅读 179 次

问题详情

First aid can save a person"s life if ______ immediately and properly.
A．perform
B．performing
C．performed
D．to perform请帮忙给出正确答案和分析，谢谢！

正确答案：C
解析：补充完整的从句为if first aid is performed immediately and properly。