Studiesof the human "sleep-wake cycle" have practical relevance for mattersranging
fromduty assignments in nuclear submarines and air-trafficcontrol towers to the staff of
shiftsin 24-hour factories.
(A) to the staff of
(B) to those who staff
(C) to the staffing of
(D) and staffing
(E) and the staff of
不是关于这道题,是红色部分的and前后并列,这段话在这里读的很清楚,但是好像记得平行并列的介词in应该前后一起补出,这里可以需要不上吗?
请指点,谢谢
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