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

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