问题
选择题
What actually ______ the accident has not yet been determined.
A．brought out
B．brought on
C．brought about
D．brought up
答案
答案：C
词组考查题。Bring out 出版、阐明； bring on 使成长、提高； bring about 引起、导致； bring up 抚育、呕吐 还没确定是什么引起了这次事故。 选C
