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Visitors   feed the animals when they are watching them.(  ) A.won't B.mustn't C.shouldn't D.needn...

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belonged to; feed on    belonging to; feed on    were belonged to; feed on    belonging to; feeding on  
live on  feed on   feed  raise  
are visitors allowed    visitors are allowed    do visitors allow    visitors allow   
allow visitors    are visitors allowed    visitors are allowed    are allowed visitors  
live with  depend in  feed on  eat at  
live with  depend in  feed on  eat at  
feed, on    feed, to    give, to    eat, from  
Feeding  feeds  to feed  fed  
feed in   live in   feed on   fed on  
be fed  feed  having fed  being fed  
are fed with   feed to   are fed to   feed on