In most South American countries rail transport is plagued by operational problems as well as by obsolete equipment.

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问题 In most South American countries rail transport is plagued by operational problems as well as by obsolete equipment.

选项 A、deficient
B、outdated
C、inferior
D、imperfect

答案B

解析 译文为:在大多数南美国家,铁路运输受到运营问题和过时设备的困扰。obsolete“过时的”,deficient“不充分的”,outdated“过时的”,inferior“次等的”,imperfect“不完美的”。
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