问题标题：
【把下列句子改为被动语态.1、Theyhavebuiltmanytallbuildings.Manytallbuildings____________.2、Youmusthandinyourhistoryhomeworkbytheweekend.Yourhistoryhomework________________bytheweekend.3、LastSundaywehea】
问题描述：
把下列句子改为被动语态.1、Theyhavebuiltmanytallbuildings.
Manytallbuildings____________.
2、Youmusthandinyourhistoryhomeworkbytheweekend.
Yourhistoryhomework________________bytheweekend.
3、LastSundayweheardthemsingBeijingOperainthetheater.
They________________BeijingOperainthetheaterlastSunday.
4、Youshouldwatertheflowersonceaday.
Theflowers_____________onceaday.
5、DopeoplegrowriceinNorthChina
____rice____inNorthChina
6、Didn'ttheytellyouaboutit
____you____aboutit
付源泉回答：
1.havebeenbuilt
2.mustbehandedin
3.wereheardthemsing
4.shouldbewatered
5.isgrew
6.Aren'ttold
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