Glass-fiber cables can carry hundreds of telephone conversations ______ .A、at le

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问题 Glass-fiber cables can carry hundreds of telephone conversations ______ .

选项 A、at length
B、at the moment
C、at the same time
D、at intervals

答案 C

解析 at length最后/at the moment此刻/at the same time同时/at intervals不时地。

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