2. 外语
  3. We are all concerned for the (secure)______ of the passengers on the aircraft.

We are all concerned for the (secure)______ of the passengers on the aircraft.

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问题 We are all concerned for the (secure)______ of the passengers on the aircraft.
选项
答案Security
解析 空格前是介词for，其后要跟名词或代词作宾语。the和of之间通常是名词，在本题中即是如 此。但有时the和0f之间也可以用形容词最高级。
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