All of them are b( ) doing their homework now.填一个词,所填词开头为“b”.

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Allofthemareb()doingtheirhomeworknow.填一个词,所填词开头为“b”.Allofthemareb()doingtheirhomeworknow.填一个词,所填词开头为

All of them are b( ) doing their homework now.填一个词,所填词开头为“b”.
All of them are b( ) doing their homework now.填一个词,所填词开头为“b”.

All of them are b( ) doing their homework now.填一个词,所填词开头为“b”.
All of them are b(eginning ) doing their homework now.