We think that the duty of the police is to (sure) ______ that people are protected from crime.

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问题 We think that the duty of the police is to (sure) ______ that people are protected from crime.

选项

答案ensure

解析 本题测试的是词性转换。全句的意思是:“我们认为警察的职责是保护人们免受犯罪伤害。”根据句意,本题需用动词“保证”,因此sure应转换成动词ensure。
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