问题补充:
The policeman the traffic to move forward after the traffic light turns green.
A. leads to
B. signals to
C. asks for
D. informs of
答案:
A. leads to
(答案→)B. signals to
C. asks for
D. informs of
解析:signal to意为“给……发信号;示意”;lead to意为“导致”;ask for意为“请求”;inform of意为“通知;告诉”。