Oldfashioned phones matter when wireless networks ________ in disasters.(2013·福建，28)
| A．turn down | B．turn out |
| C．break down | D．break out |
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Oldfashioned phones matter when wireless networks ________ in disasters.(2013·福建，28)
| A．turn down | B．turn out |
| C．break down | D．break out |
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