问题
选择题
Private cars are required to take turns off roads one out of five weekdays ____the
traffic pressure.
A．to reduce
B．reducing
C．reduce
D．reduced
答案
A
考查非谓语动词。句子没有连词，所以可
以得出该处应用非谓语动词形式，排除C、D两
项；此处用不定式表目的。