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1 . Since the new speed limits ______, the number of accidents in the area has fallen strikingly．
| A．were introduced |
| B．introduced |
| C．have been introduced |
| D．have introduced |
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2016-11-26更新
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124次组卷
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3卷引用：2015届北京市第六十六中学高三上学期第一次质量检测英语试卷
