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(2013·福建,28)Old-fashioned phones matter when wireless networks ________ in disasters.
A.turn downB.turn out
C.break downD.break out
D
考查动词短语辨析。A项“调小,拒绝”;B项“结果证明……”;C项“出故障,分解”;D项“爆发”。句意:当发生灾难无线网络无法用的时候,老式的电话就有作用了。故答案为C。
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