According to the factory safety rules, all accidents be reported to the safety officer.
A. may
B. can
C. would
D. shall
网友回答
A. may
B. can
C. would
(答案→)D. shall
解析：考查情态动词。句意：根据工厂的安全法规，所有的事故都必须向安全科上报。shall用于第二三人称，表示命令、警告、威胁等语气，还可表示规定，根据rules可知，这里指的是规定，故选D。