用括号了适当的形式填空.1.Great changes__(take place)since liberation.2.It' not polite__(laugh)at people.3.A new hospital__(build)now.4."9.11"__(can't forget) by the people all over the world.

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用括号了适当的形式填空.1.Great changes__(take place)since liberation.2.It' not polite__(laugh)at people.3.A new hospital__(build)now.4.

用括号了适当的形式填空.1.Great changes__(take place)since liberation.2.It' not polite__(laugh)at people.3.A new hospital__(build)now.4."9.11"__(can't forget) by the people all over the world.
用括号了适当的形式填空.1.Great changes__(take place)since liberation.2.It' not polite__(laugh)at people.3.A new hospital__(build)now.4."9.11"__(can't forget) by the people all over the world.

用括号了适当的形式填空.1.Great changes__(take place)since liberation.2.It' not polite__(laugh)at people.3.A new hospital__(build)now.4."9.11"__(can't forget) by the people all over the world.
1.Great changes have taken place since liberation.2.It' not polite to luagh at people.3.A new hospital is being build now.4."9.11" can't be forgotten by the people all over the world.

have taken place to laugh has been built can‘t be forgetten