According to the factory safety rules all accidents be reported to the safety officer.A.

问题补充：

According to the factory safety rules, all accidents be reported to the safety officer.

A. may

B. can

C. would

D. shall

答案：

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。