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外语
The police were on the alert______any suspicious packages that might contain chemicals.
The police were on the alert______any suspicious packages that might contain chemicals.
admin
2013-06-19
24
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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专业英语四级
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