问题补充：
The new airport has been in for two years and it to be a quiet place.
A. using; used
B. use; used
C. used; use
D. useful; use
答案：
A. using; used
(答案→)B. use; used
C. used; use
D. useful; use
解析：be in use 表示使用，used to be adj ，故选B
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