The mother who lost her son insisted that the careless driver______for the traffic accident ______yesterday.A.was to blame ; happeningB.be to blame ; happenedC.be blamed ; was happenedD.was to blame; had happened
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A解析考查短语及非谓语动词。be to blame for应受到责备；happening yesterday现在分词作定语，修饰名词the traffic accident，为主动关系，选A。