679. Studies of the human “sleep-wake cycle” have practical relevance for matters ranging from duty assignments in nuclear submarines and air-traffic control towers to the staff of shifts in 24-hour factories.
(A) to the staff of
(B) to those who staff
(C) to the staffing of
(D) and staffing（C）
(E) and the staff of
请问:the staff 和the staffing 有什么区别么?该怎样使用呢?谢谢!
这里from A to B，duty assignment 和 the staffing平行更合适，强调动作；和the staff全体职员逻辑意思上不平行
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