单选题：Undocumented workers became the target of“Operation Safe Tra

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题目类型：单选题
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题目内容：

Undocumented workers became the target of“Operation Safe Travel”because． A．evidence was found that they were potential terrorists
B．most of them worked at airports under threat of terrorist attacks
C．terrorists might take advantage of their illegal status
D．they were reportedly helping hide terrorists around the airport

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分类：综合类题型：单选题

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分类：综合类题型：单选题