单项选择 较易0.85 引用1 组卷51
China Railway Corporation has decided that people can book tickets 60 days ________.
| A．at ease | B．in advance | C．by chance | D．in general |
20-21高一下·新疆乌鲁木齐·期末
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| A．in return | B．by chance | C．in turn | D．for once |
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