A recent spate of road traffic accidents has stirred up much controversy over ways to increase road safety, and though some protective measures, like the establishment of pedestrian subways and vehicle flyovers, having been taken decades ago, great increases in vehicle density and in pedestrian population are levying a heavy burden on the traffic system.
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Athough some protective measures, like the establishment of pedestrian subways and vehicle flyovers, having been taken decades ago, great increases in vehicle density
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Bthough some protective measures, such as the establishment of pedestrian subways and vehicle flyovers, were taken decades ago, great increases in vehicle density
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Cthough some protective measures, such as establishing pedestrian subways and vehicle flyovers, having been taken decades ago, great vehicle density increases
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Dwith some protective measures, like establishing pedestrian subways and vehicle flyovers that were taken decades ago, great increases in vehicle density
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Ewith some protective measures, such as the establishment of pedestrian subways and vehicle flyovers, having been taken decades ago, great vehicle density increases
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正确答案: B