Many Americans think a national committee should be formed to discuss ______ to existing mass transit system.

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问题 Many Americans think a national committee should be formed to discuss ______ to existing mass transit system.

选项 A、alterations
B、alternations
C、attendants
D、alternatives

答案A

解析 alterations变更,修改。alternations间隔;轮流,交替。attendants出席者;随从。alternatives选择;供选择的东西。
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