The police were on the alert______any suspicious packages that might contain che

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问题 The police were on the alert______any suspicious packages that might contain chemicals.

选项 A、for
B、to
C、at
D、with

答案 A

解析 be on the alert for表示“警惕着，对……保持戒备(状态)”，如：Police warned thepublic to be on the alert for suspected terrorists．警方警告群众警惕涉嫌的恐怖分子。

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