To buyaticket ,you__line up at this window去知道提问

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Tobuyaticket,you__lineupatthiswindow去知道提问Tobuyaticket,you__lineupatthiswindow去知道提问Tobuyaticket,you__

To buyaticket ,you__line up at this window去知道提问
To buyaticket ,you__line up at this window去知道提问

To buyaticket ,you__line up at this window去知道提问
must,考的是情态动词

should

To buy a ticket,you should line up at the windows.