问题
选择题
________ the danger of drunk driving, many drivers promised never to drive after drinking.
A．Realizing
B．To have realized
C．Realized
D．Having realized
答案
答案：D
根据下文为过去时态,可知前文应为完成时态,意识到醉酒驾驶的危害,许多司机承诺永远不酒后驾车.