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We need to put safeguards ______ to prevent this type of accident occurring again.
A.in mindB.in troubleC.in generalD.in place
D

试题分析:考查介词短语:A. in mind在脑海中,思考,B. in trouble有困难,C. in general总体上, D. in place在适当的位置,安排就绪,句意:我们需要安排保安在适当的位置,以防这类事件再次发生。选D。
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