We need to put safeguards to prevent this type of accident occurring again.
A. in mind
B. in trouble
C. in general
D. in place
网友回答
A. in mind
B. in trouble
C. in general
(答案→)D. in place
解析：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。