The government is _____ and will take the necessary steps to maintain security and stability.
A.on the alert
B.out of control
C.on guard
D.in vain
网友回答
A解析 on the alert (=alert; watchful; careful) 警惕，小心：Drivers must be on the alert for traffic signals. (=Drivers must be especially careful to see signals when driving a car.) (司机必须密切注视交通信号。)out of control 失去控制；on guard站岗；in vain 徒劳，无效。