The mother who lost her son insisted that the careless driver for the traffic accident yesterday .
A. was to blame ; happening
B. be to blame ; happened
C. be blamed ; was happened
D. was to blame; had happened
网友回答
(答案→)A. was to blame ; happening
B. be to blame ; happened
C. be blamed ; was happened
D. was to blame; had happened
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。