问题
选择题
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
答案
答案：A
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。