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Every drive ___ ___adriver's license急 ,

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Every drive ___ ___adriver's license急 ,
must have
再问: Thank you ~~~那么To buy a ticket ,you ————line up at this window。谢谢
再答: must
再问: 为什么不能用hav e to?
再答: 很多情况下,have to =must,have to语气没有must强
再问: Don't standclose to the tracks.you__stand behind this yellow line
再答: 同样must, have to通常用于有客观原因的.