冬季安全检查应结合季节特点，重点查防火、防小动物措施。（）
参考答案：错
This machine, ______for many years, is still working perfectly.
A．after which I have looked
B．which I have looked after
C．that I have looked after
D．I have looked after
一辆自行车打八五折后售价153元，打折后便宜了______元．
