We think that the duty of the police is to (sure) ______ that people are protect

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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的用法。句中用“be to+动词原形”动词不定式作表语，因此形容词sure需转换成动词ensure(确保)。

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