A-A+
The noise-killing system is not yet popular ma
问题详情
The noise-killing system is not yet popular mainly because ______.
A．it is still being tried out
B．drivers still have their doubts
C．it increases the cost of car production
D．carmakers are not sure if it is necessary请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：C
解析：从文章最后一段最后一句But the carmakers haven't decided if they will carry it into production because it would add several hundred dollars to the cost of their cars．得知。
