填适当介词1、Mike is only 14 years old,but he has tralled from Nanjing to beijing _ his own many times.2、This new railway station will be _ service next year.

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填适当介词1、Mike is only 14 years old,but he has tralled from Nanjing to beijing _ his own many times.2、This new railway station will be _ service next year.
填适当介词
1、Mike is only 14 years old,but he has tralled from Nanjing to beijing _ his own many times.
2、This new railway station will be _ service next year.

填适当介词1、Mike is only 14 years old,but he has tralled from Nanjing to beijing _ his own many times.2、This new railway station will be _ service next year.
1.on
2.in

by
on