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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