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
(E) and the staff of
Tough one!
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from X to Y ...rules out D,EGmatKiss wrote: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
(E) and the staff of
X and Y need to be parallel
X is "duty assignments in nuclear submarines and air-traffic control towers"
so Y can not be people or staff...so that rules out A,B
IMO C
please give OA.
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