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drgmatIL
- Master | Next Rank: 500 Posts
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- Joined: Sat Aug 02, 2008 12:49 pm
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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
why A is wrong? why C is correct?
thanks
(A) to the staff of
(B) to those who staff
(C) to the staffing of
(D) and staffing
(E) and the staff of
why A is wrong? why C is correct?
thanks
