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完形填空  We can see many traffic signs on both sides of the roa

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完形填空
  We can see many traffic signs on both sides of the roads or streets.Some tell the drivers what to do,and others tell them what not to do.
  The traffic signs are the traffic rules.All people must obey the rules and mustn’t break them.Each traffic sign has its meaning.
  Do you see the sign “P”?Do you know its meaning?
  In big cities,there are a lot of cars,trucks and buses.They can’t stop on the streets at any time.If a driver wants to stop his car,he must look for a place for his car —a car stop.A car stop is like a special “hotel” and it is for cars to “live in”.For a driver,how does he find a “hotel” for his cars?The traffic sign “P” can help him.“P” is the first letter of the word “Park” and its meaning is “You can stop your car here!”_____ important to obey the traffic rules.
  (  )A.That    B.That's    C.It     D.It's
D
固定用法 It's adj. to do sth