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

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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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