单项选择题

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单项选择题
A．By sea.B．By train.C．By air.
A．By sea.
B．By train.
C．By air.
单项选择题
A．He has to look carefully.B．He has to go to school.C．He has to go to see a doctor.
A．He has to look carefully.
B．He has to go to school.
C．He has to go to see a doctor.
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