The _______ work continued for more than a week but there was still no sign of the missing boy. ( 章节：2 难度：2)
- A、research
- B、rescue
- C、vessel
- D、vast
正确答案:B
答案解析:有
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The _______ work continued for more than a week but there was still no sign of the missing boy. ( 章节：2 难度：2)
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