Event organizers have worked hard to ( ) that the games will not pollute the environment. ( 章节：3 难度：2)_做题室

单项选择题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：
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