2. 外语
  3. Before leaving the office, the last person is required to make sure all of the windows and doors are______locked.

Before leaving the office, the last person is required to make sure all of the windows and doors are______locked.

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问题 Before leaving the office, the last person is required to make sure all of the windows and doors are______locked.
选项 A、security
B、secured
C、securely
D、secure
答案C
解析 单词形态：副词1．这是一道单词形态选择题，选项均为secure的不同形式。2．空格在be动词和过去分词之间，因此空格内应填入一个副词修饰动词。所以副词(C)securely为正确选项。
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