The dog needs a lot of------(训练)to help the blind cross the road.

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• 一片难的英语完形填空Gail and her dog,Sam,are standing at the street corner.They\'re waiting for the cars to go by.They want to go 41 the street.She is waiting for Sam to decide when they should cross.　　42 blind people use special,trained( 受过训练的) dogs to help them tell when and where they would go.But not every dog can do 43 .A dog for the blind must be clever.The dog must be 44 at a special school.He is taught to walk 45 the trainer\'s legs.He is taught to walk
• The dog needs a lot of------(训练)to help the blind cross the road.
• The dog needs a lot of------(训练)to help the blind cross the road.
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