By regulation, it is ___ for all workers to wear protective clothing when they are operating the machine.
Adiligent
Boverwhelming
Cindustrious
Dobligatory正確答案
答案與詳解
obligatory 意為「義務的、強制的」,常用句型 It is obligatory for sb. to V(某人有義務做某事),完美呼應 By regulation(依規定)的語境。
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