we____signals for help from the burning houseA.picked out B.depended on C.picked up D.focused on

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we____signals for help from the burning houseA.picked out B.depended on C.picked up D.focused on
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we____signals for help from the burning houseA.picked out B.depended on C.picked up D.focused on
we____signals for help from the burning house
A.picked out B.depended on C.picked up D.focused on

we____signals for help from the burning houseA.picked out B.depended on C.picked up D.focused on
C.picked up 发现:偶然遇到并观测