AIf carefully Bdoing , the experiment Cwill be Dsuccessful .

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问题 AIf carefully Bdoing , the experiment Cwill be Dsuccessful .

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答案B

解析此题考查非谓语动词。句中动词“do”与其主语“experiment”之间是明显的被动关系，故完整的句子应为“If it is carefullydone，the experiment will be successful”，此处因为主句的主语“the experiment”与从句的主语“it”一致，故从句可省略为“If carefully done”。

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