As they were crossing a bridge ,they h( ) someone cryig for help.

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As they were crossing a bridge ,they h( ) someone cryig for help.

As they were crossing a bridge ,they h( ) someone cryig for help.
As they were crossing a bridge ,they h( ) someone cryig for help.

As they were crossing a bridge ,they h( ) someone cryig for help.
heard
As they were crossing a bridge ,they ( heard)someone cryig for help.

heard 是正解。
这是一道时态题。were提示用过去时,后文联想是听见了帮助。因此用hear的过去式heard。