Event organizers have worked hard to ( ) that the games will not pollute the environment. ( 章节：3 难度：2)
- A、assure
- B、ensure
- C、insure
- D、reassure
正确答案:B
答案解析:有
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Event organizers have worked hard to ( ) that the games will not pollute the environment. ( 章节：3 难度：2)
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