1、He was in the library two hours ago.对划线部分提问（two hours ago）
When was he in the library?
2、It was very interesting.（改为一般疑问句并做否定回答）
Was it very interesting?No,it wasn't.
3、The children were at school last Friday.对划线部分提问（The children）
Who were at school last Friday?
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