Most train tickets are_________for two to five days, depending on the distance you travel.

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问题 Most train tickets are_________for two to five days, depending on the distance you travel.

选项 A、effective
B、efficient
C、valid
D、legal

答案C

解析 考查形容词辨析。句意:绝大多数火车票的有效期是二到五天,有效期的长短取决于旅途的距离。effective起作用的,实际的;efficient有效率的;valid有效的;legal合法的。根据句意,valid最合适。
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