The troops have been on the ______ for a possible enemy attack.

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问题 The troops have been on the ______ for a possible enemy attack.

选项 A、alarm
B、alert
C、warning
D、notice

答案B

解析 A. alarm报警,警报,警报器,B.alert警惕,警报,on the alert for警惕……,警觉……,随时准备着,密切注意着;C. warning警告,D.notice注意,通知。
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