This line was carrying equal number of eastbound and westbound trains, and they

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问题 This line was carrying equal number of eastbound and westbound trains, and they _________ regularly.

选项 A、altered
B、alternated
C、switched
D、exchanged

答案 B

解析考点单词辨析题。圣要辨析近义动词之间的细微区别。alter“修改，改动，改变，改建”；alternate“交替，轮流，改变，依次”；switch“转换，转变”；exchange“交换，调换，兑换，交流，交易”。在这里，应是“轮流、依次”之意，故可选B)。

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