問題詳情
2.17 In an effort to cut back _____ costs, many airlines have discontinued full-mealservice.
(A) in
(B) at
(C) on
(D) to
(A) in
(B) at
(C) on
(D) to
參考答案
答案：[無官方正解]
難度：計算中-1
書單：沒有書單，新增
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