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被动练习

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( B )1.The workers made great contributions ______the tall building. A. to build B. to building C. build ( B )2.___of the students are playing outside, for it’s raining. A. No one B. None C. Someone ( B )3.The policeman warns the boys ____ on the street. A. to play B. not to play C. don’t to play

被动练习

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