They are now under a great deal of pressure to tighten their airport （）.-未来题库

They are now under a great deal of pressure to tighten their airport （）.

未来题库→百科

They are now under a great deal of pressure to tighten their airport （）.

A.danger

B.solidity

C.insecurity

D.security

正确答案：security

Tags:pressure airport tighten

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