作业帮Helen can't find her backpack.改成同义句改成：Helen doesn't know____her backpack_______.
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Helen can't find her backpack.改成同义句改成：Helen doesn't know____her backpack_______.
Helen can't find her backpack.改成同义句
改成：
Helen doesn't know____her backpack_______.
Helen can't find her backpack.改成同义句改成：Helen doesn't know____her backpack_______.
Helen doesn't know if her backpack is lost.
Helen doesn't know where her backpack is.
where...is