It was too hard for the firefighters to ...

It was too hard for the firefighters to get close to the burning building. All their attempts to rescue the people trapped were ______.

A. in place B. in return

C. in vain D. in danger

C 【解析】试题分析: 句意：对于消防员来说接近燃烧的大楼太难了。所有营救被困人员的努力都已经就绪了。A. in place 在适当的位置，就绪； B. in return作为回报； C. in vain徒劳； D. in danger在危险中，选A。考点：考查短语辨析

考点分析：

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