问题描述：
upset announce用法
He came into the classroom( ) A very upset B being upset C to upset D to be upset
At this moment the bell rang ,( )the end of class A announced B having announced C announcing D to announce
为什么 关键是原因啊 别人问我我不会啊
He came into the classroom( ) A very upset B being upset C to upset D to be upset
At this moment the bell rang ,( )the end of class A announced B having announced C announcing D to announce
为什么 关键是原因啊 别人问我我不会啊
问题解答：
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