he learned ( ) a piece of news.

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helearned()apieceofnews.helearned()apieceofnews.helearned()apieceofnews.这个空应该不填也可以啊……要填什么词性的词呢?

he learned ( ) a piece of news.
he learned ( ) a piece of news.

he learned ( ) a piece of news.
这个空应该不填也可以啊……要填什么词性的词呢?