The ______ of new traffic signals on Baker Street has been only moderate-ly successful in lowering traffic con-gestion.

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问题 The ______ of new traffic signals on Baker Street has been only moderate-ly successful in lowering traffic con-gestion.

选项 A、designs
B、installments
C、applications
D、modifications

答案B

解析 词汇题。design意为“设计”;application意为“运用”,常与介词to搭配使用;modification意为“修正,修改”;installment意为“安装”;根据句意,交通信号灯的安装,最符合题意,故选B。
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